A man is a boy who grew up: an adult male. Man has hundreds of other meanings too, most of them guy-related.

In addition to being the male equivalent of a woman, the word man has many meanings in English. Not long ago, man used to mean the same thing as people, as in humanity or mankind. Baseball teams want to get a man on base. Manning up is showing courage. Manning a business is providing workers for that business, including someone to man the phones. In a game like Monopoly, your piece is your man. Also, a common greeting is "Hey, man!"

Definitions of man
  1. noun
    an adult person who is male (as opposed to a woman)
    “there were two women and six men on the bus”
    synonyms: adult male
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    adult female, woman
    an adult female person (as opposed to a man)
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    (Old Testament) in Judeo-Christian mythology; the first man and the husband of Eve and the progenitor of the human race
    (Old Testament) Cain and Abel were the first children of Adam and Eve born after the Fall of Man; Cain killed Abel out of jealousy and was exiled by God
    (Old Testament) Cain and Abel were the first children of Adam and Eve born after the Fall of Man; Abel was killed by Cain
    (Old Testament) third son of Adam and Eve; given by God in place of the murdered Abel
    (Old Testament) son of Noah
    (Old Testament) son of Noah
    (Old Testament) eldest son of Noah
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    Black man
    a man who is Black
    white man
    a man who is White
    baboo, babu
    used as a Hindi courtesy title; equivalent to English `Mr'
    bachelor, unmarried man
    a man who has never been married
    (formerly) a title of respect for a man in Turkey or Egypt
    a friendly informal reference to a grown man
    beau, boyfriend, fellow, swain, young man
    a man who is the lover of a girl or young woman
    a man who is no longer a woman's boyfriend
    Samson, bruiser, bull, strapper
    a large and strong and heavyset man
    beau, clotheshorse, dandy, dude, fashion plate, fop, gallant, sheik, swell
    a man who is much concerned with his dress and appearance
    Esq, Esquire
    a title of respect for a member of the English gentry ranking just below a knight; placed after the name
    castrate, eunuch
    a man who has been castrated and is incapable of reproduction
    father figure, father surrogate
    a man who takes over all the functions of the real father
    a man (often a powerful or influential man) who arouses emotions usually felt for your real father and with whom you identify psychologically
    buster, dude, fellow
    an informal form of address for a man
    a disreputable or clumsy person
    a man who is (usually) old and/or eccentric
    a man of refinement
    divorced man, grass widower
    a man who is divorced from (or separated from) his wife
    bozo, cat, guy, hombre
    an informal term for a youth or man
    a German man; used before the name as a title equivalent to Mr in English
    Hooray Henry
    a lively and ineffectual upper-class young man
    a man in charge of children in an institution
    a well-built, attractive man
    ex, ex-husband
    a man who was formerly a certain woman's husband
    a man with whom you are in love or have an intimate relationship
    iron man, ironman
    a strong man of exceptional physical endurance
    a man of great strength or bravery
    any handsome young man
    middle-aged man
    a man who is roughly between 45 and 65 years old
    used as a French courtesy title; equivalent to English `Mr'
    old boy, old man
    a familiar term of address for a man
    Methuselah, graybeard, greybeard, old man
    a man who is very old
    paterfamilias, patriarch
    the male head of family or tribe
    Peter Pan
    a boyish or immature man; after the boy in Barrie's play who never grows up
    a man who is effeminate in his manner and fussy in the way he dresses
    an able-bodied man serving as a member of a posse
    a Portuguese title of respect; equivalent to English `Mr'
    an adult male who shaves
    signior, signor
    used as an Italian courtesy title; can be prefixed to the name or used separately
    an Italian title of respect for a man; equivalent to the English `sir'; used separately (not prefixed to his name)
    term of address for a man
    an ordinary man
    he-man, macho-man, stud
    a man who is virile and sexually active
    (sometimes used ironically) a man of great strength and agility (after the hero of a series of novels by Edgar Rice Burroughs)
    widower, widowman
    a man whose wife is dead especially one who has not remarried
    philanderer, womaniser, womanizer
    a man who likes many women and has short sexual relationships with them
    golden boy, wonder boy
    a man who is unusually successful at an early age
    young buck, young man
    a teenager or a young adult male
    soul brother
    a fellow Black man
    broth of a boy, broth of a man
    an outstanding person; as if produced by boiling down a savory broth
    any man noted for his amorous adventures
    codger, old codger
    used affectionately to refer to an eccentric but amusing old man
    cockscomb, coxcomb
    a conceited dandy who is overly impressed by his own accomplishments
    dirty old man
    a middle-aged man with lecherous inclinations
    a Spanish gentleman or nobleman
    Don Juan
    any successful womanizer (after the legendary profligate Spanish nobleman)
    foster father, foster-father
    a man who is a foster parent
    informal abbreviation of `gentleman'
    one of 40 gentlemen who attend the British sovereign on state occasions
    good ol' boy, good old boy, good ole boy
    a white male Southerner with an unpretentious convivial manner and conservative or intolerant attitudes and a strong sense of fellowship with and loyalty to other members of his peer group
    a successful womanizer; a man who behaves selfishly in his sexual relationships with women
    a British dandy in the 18th century who affected Continental mannerisms
    antique, gaffer, old geezer, old-timer, oldtimer
    an elderly man
    one of the boys
    a man who has been socially accepted into a group of other men
    a man who is older and higher in rank than yourself
    an informal British term for a youth or man
    squaw man
    a white man married to a North American Indian woman
    the husband of your mother by a subsequent marriage
    masher, skirt chaser, wolf, woman chaser
    a man who is aggressive in making amorous advances to women
    type of:
    adult, grownup
    a fully developed person from maturity onward
    male, male person
    a person who belongs to the sex that cannot have babies
  2. noun
    an adult male person who has a manly character (virile and courageous competent)
    “the army will make a man of you”
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    type of:
    male, male person
    a person who belongs to the sex that cannot have babies
  3. noun
    a male person who plays a significant role (husband or lover or boyfriend) in the life of a particular woman
    “she takes good care of her man
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    a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man
    type of:
    a significant other to whom you are not related by marriage
    male, male person
    a person who belongs to the sex that cannot have babies
  4. noun
    someone who serves in the armed forces; a member of a military force
    “two men stood sentry duty”
    synonyms: military man, military personnel, serviceman
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    a nonmilitary citizen
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    air force officer, commander
    an officer in the airforce
    artilleryman, cannoneer, gunner, machine gunner
    a serviceman in the artillery
    bluejacket, navy man, sailor, sailor boy
    a serviceman in the navy
    commando, ranger
    a member of a military unit trained as shock troops for hit-and-run raids
    conscript, draftee, inductee
    someone who is drafted into military service
    enlisted person
    a serviceman who ranks below a commissioned officer
    Marine, devil dog, leatherneck, shipboard soldier
    a member of the United States Marine Corps
    military officer, officer
    any person in the armed services who holds a position of authority or command
    a member of the armed forces who does not participate in combat (e.g. a chaplain or surgeon)
    a member of a military force who is residing in a conquered foreign country
    a serviceman who wears stripes on the uniform to indicate rank or years of service
    ex-serviceman, vet, veteran
    a person who has served in the armed forces
    veteran, veteran soldier
    a soldier who has seen considerable active service
    military volunteer, voluntary, volunteer
    (military) a person who freely enlists for service
    adjutant, aide, aide-de-camp
    an officer who acts as military assistant to a more senior officer
    army officer
    an officer in the armed forces
    brass hat
    a high-ranking military officer
    chief of staff
    the senior officer of a service of the armed forces
    a member of a coastguard
    commandant, commander, commanding officer
    an officer in charge of a military unit
    commissioned officer
    a military officer holding a commission
    desk officer
    a military officer who is not assigned to active duty
    enlisted man
    a male enlisted person in the armed forces
    enlisted woman
    a female enlisted person in the armed forces
    executive officer
    the officer second in command
    inspector general
    a military officer responsible for investigations
    KP, kitchen police
    an enlisted person who is assigned to assist the cooks
    a member of the American Legion
    military adviser, military advisor
    a military officer who serves as an adviser to the troops of an allied nation
    naval officer
    an officer in the navy
    Navy SEAL, SEAL
    a member of a Naval Special Warfare unit who is trained for unconventional warfare
    enlisted officer, noncom, noncommissioned officer
    a military officer appointed from enlisted personnel
    an enlisted man or woman who serves in an army
    someone receiving intensive training for a naval technical rating
    a member of the crew of a submarine
    warrant officer
    holds rank by virtue of a warrant
    Grigori Aleksandrovich Potemkin, Grigori Potemkin, Grigori Potyokin, Potemkin, Potyokin
    a Russian officer and politician who was a favorite of Catherine II and in 1762 helped her to seize power; when she visited the Crimea in 1787 he gave the order for sham villages to be built (1739-1791)
    type of:
    skilled worker, skilled workman, trained worker
    a worker who has acquired special skills
  5. noun
    a male subordinate
    “the chief stationed two men outside the building”
    “he awaited word from his man in Havana”
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    type of:
    foot soldier, subordinate, subsidiary, underling
    an assistant subject to the authority or control of another
  6. noun
    a manservant who acts as a personal attendant to his employer
    “Jeeves was Bertie Wooster's man
    synonyms: gentleman, gentleman's gentleman, valet, valet de chambre
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    type of:
    body servant
    a valet or personal maid
    a man servant
  7. noun
    any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage
    synonyms: homo, human, human being
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    human beings, human race, humanity, humankind, humans, mankind, world
    all of the living human inhabitants of the earth
    Homo erectus
    extinct species of primitive hominid with upright stature but small brain
    Homo soloensis
    extinct primitive hominid of late Pleistocene; Java; formerly Javanthropus
    Homo habilis
    extinct species of upright East African hominid having some advanced humanlike characteristics
    Homo sapiens
    the only surviving hominid; species to which modern man belongs; bipedal primate having language and ability to make and use complex tools; brain volume at least 1400 cc
    Homo sapiens neanderthalensis, Neandertal, Neandertal man, Neanderthal, Neanderthal man
    extinct robust human of Middle Paleolithic in Europe and western Asia
    Homo rhodesiensis, Rhodesian man
    a primitive hominid resembling Neanderthal man but living in Africa
    Java man, Trinil man
    fossil remains found in Java; formerly called Pithecanthropus erectus
    Peking man
    fossils found near Beijing, China; they were lost during World War II
    Solo man
    early man of late Pleistocene; skull resembles that of Neanderthal man but with smaller cranial capacity; found in Java
    extinct human of Upper Paleolithic in Europe
    Boskop man
    possible early Homo sapiens represented by a cranium found in the Transvaal; formerly considered a separate species
    Homo sapiens sapiens, modern man
    subspecies of Homo sapiens; includes all modern races
    type of:
    a primate of the family Hominidae
  8. noun
    the generic use of the word to refer to any human being
    “it was every man for himself”
  9. noun
    all of the living human inhabitants of the earth
    synonyms: human beings, human race, humanity, humankind, humans, mankind, world
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    type of:
    group, grouping
    any number of entities (members) considered as a unit
    homo, human, human being
    any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage
  10. noun
    game equipment consisting of an object used in playing certain board games
    “he taught me to set up the men on the chess board”
    synonyms: piece
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    (board games) the darker pieces
    checker, chequer
    one of the flat round pieces used in playing the game of checkers
    chess piece, chessman
    any of 16 white and 16 black pieces used in playing the game of chess
    game equipment consisting of a flat thin piece marked with characters and used in board games like Mah-Jong, Scrabble, etc.
    (board games) the lighter pieces
    (chess) a piece that can be moved diagonally over unoccupied squares of the same color
    castle, rook
    (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard
    (chess) the weakest but the most important piece
    a checker that has been moved to the opponent's first row where it is promoted to a piece that is free to move either forward or backward
    horse, knight
    a chessman shaped to resemble the head of a horse; can move two squares horizontally and one vertically (or vice versa)
    (chess) the least powerful piece; moves only forward and captures only to the side; it can be promoted to a more powerful piece if it reaches the 8th rank
    (chess) the most powerful piece
    type of:
    game equipment
    equipment or apparatus used in playing a game
  11. verb
    provide with workers
    “We cannot man all the desks”
    “Students were manning the booths”
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    serve as a crew member on
    type of:
    provide with staff
  12. verb
    take charge of a certain job; occupy a certain work place
    “Mr. Smith manned the reception desk in the morning”
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    type of:
    do work, work
    be employed
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