A chair is a seat with four legs and a back to lean against. When you invite a large group for dinner, you have to make sure you find chairs for all of your guests.

As opposed to a bench, couch, or sofa, a chair usually seats one single person. You might have wooden kitchen chairs and a comfortable, upholstered chair with arms for watching TV. Another kind of chair is the leader of an organization or group, and it's also a verb meaning to lead such a group: "I've been asked to chair the monthly meetings of the stamp collectors' club." The Old French root is chaiere, "seat or throne."

Definitions of chair
  1. noun
    a seat for one person, with a support for the back
    “he put his coat over the back of the chair and sat down”
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    chair with a support on each side for arms
    barber chair
    a large fixed adjustable chair in which barbers seat their customers
    chair of state
    a ceremonial chair for an exalted or powerful person
    chaise, chaise longue, daybed
    a long chair; for reclining
    Eames chair
    a chair designed by Charles Eames; originally made of molded plywood; seat and back shaped to fit the human body
    fighting chair
    a fixed chair from which a saltwater angler can fight a hooked fish
    folding chair
    a chair that can be folded flat for storage
    feeding chair, highchair
    a chair for feeding a very young child; has four long legs and a footrest and a detachable tray
    ladder-back, ladder-back chair
    a chair with a ladder-back
    garden chair, lawn chair
    chair left outside for use on a lawn or in a garden
    rocker, rocking chair
    a chair mounted on rockers
    side chair, straight chair
    a straight-backed chair without arms
    swivel chair
    a chair that swivels on its base
    tablet-armed chair
    a chair with an arm that has been widened for writing
    a movable chair mounted on large wheels; for invalids or those who cannot walk; frequently propelled by the occupant
    bath chair
    a wheelchair usually pushed by an attendant, as at a spa
    Boston rocker
    a rocking chair that has a high spindle back and a decorative top panel
    camp chair
    a light folding chair
    captain's chair
    a wooden armchair with a saddle seat and a low back that has vertical spindles
    beach chair, deck chair
    a folding chair for use outdoors; a wooden frame supports a length of canvas
    easy chair, lounge chair, overstuffed chair
    a comfortable upholstered armchair
    an upholstered armchair
    Morris chair
    an armchair with an adjustable back
    motorized wheelchair
    a wheelchair propelled by a motor
    platform rocker
    rocking chair on a stationary base
    lounger, recliner, reclining chair
    an armchair whose back can be lowered and foot can be raised to allow the sitter to recline in it
    a child's rocking chair with the seat built between two flat sides that are shaped to resemble an animal (such as a swan or duck)
    the chair of state for a monarch, bishop, etc.
    Windsor chair
    straight chair having a shaped seat and a back of many spindles
    yacht chair
    a light folding armchair for outdoor use
    type of:
    furniture that is designed for sitting on
  2. noun
    the officer who presides at the meetings of an organization
    synonyms: chairman, chairperson, chairwoman, president
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    Kalon Tripa
    the chairman of the Kashag and essentially head of the Tibetan government-in-exile
    vice chairman
    one ranking below or serving in the place of a chairman
    type of:
    presiding officer
    the leader of a group meeting
  3. verb
    act or preside as chair, as of an academic department in a university
    “She chaired the department for many years”
    synonyms: chairman
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    type of:
    head, lead
    be in charge of
  4. verb
    preside over
    synonyms: lead, moderate
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    type of:
    discuss, hash out, talk over
    speak with others about (something); talk (something) over in detail; have a discussion
  5. noun
    the position of professor
    “he was awarded an endowed chair in economics”
    synonyms: professorship
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    type of:
    berth, billet, office, place, position, post, situation, spot
    a job in an organization
  6. noun
    a particular seat in an orchestra
    “he is second chair violin”
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    type of:
    any support where you can sit (especially the part of a chair or bench etc. on which you sit)
  7. noun
    an instrument of execution by electrocution; resembles an ordinary seat for one person
    “the murderer was sentenced to die in the chair
    synonyms: death chair, electric chair, hot seat
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    type of:
    instrument of execution
    an instrument designed and used to take the life of a condemned person
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