When something's common, it's usual, or it happens frequently. It's more common than you might think for little kids to be terrified of clowns.

Things that are common happen all the time — they're ordinary. It's common for people to put ketchup on their French fries, and a pigeon is an extremely common type of bird to see in a city. Common can also refer to something that's shared by a group, like a region's common culture. In fact, a green space in the center of a town is sometimes called a common, maybe because it's shared by everyone in the town.

Definitions of common
  1. adjective
    having no special distinction or quality; widely known or commonly encountered; average or ordinary or usual
    “the common man”
    “a common sailor”
    “the common cold”
    “a common nuisance”
    “followed common procedure”
    “it is common knowledge that she lives alone”
    “the common housefly”
    “a common brand of soap”
    average, ordinary
    lacking special distinction, rank, or status; commonly encountered
    democratic, popular
    representing or appealing to or adapted for the benefit of the people at large
    of or for the common people
    frequently encountered
    prevailing among and common to the general public
    of or involving the common people as constituting a fundamental political and economic group
    commonly used or supplied
    occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure
    not exceptional in any way especially in quality or ability or size or degree
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    not common or ordinarily encountered; unusually great in amount or remarkable in character or kind
    especial, exceptional, particular, special
    surpassing what is common or usual or expected
    not widely known; especially valued for its uncommonness
    red carpet, red-carpet
    special treatment or hospitality
    not commonly encountered
    out of the ordinary
    not usual or common or ordinary
    beyond what is ordinary or usual; highly unusual or exceptional or remarkable
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  2. adjective
    to be expected; standard
    common decency”
    not exceptional in any way especially in quality or ability or size or degree
  3. adjective
    commonly encountered
    “a common (or familiar) complaint”
    synonyms: usual
    within normal everyday experience; common and ordinary; not strange
  4. adjective
    being or characteristic of or appropriate to everyday language
    common parlance”
    synonyms: vernacular, vulgar
    used of spoken and written language
  5. adjective
    belonging to or participated in by a community as a whole; public
    “for the common good”
    common lands are set aside for use by all members of a community”
    for or by a group rather than individuals
    affecting the people or community as a whole
    united or combined
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    individual, single
    being or characteristic of a single thing or person
    peculiar to the individual
    individualist, individualistic
    marked by or expressing individuality
    man-to-man, one-on-one
    being a system of play in which an individual defensive player guards an individual offensive player
    respective, several, various
    considered individually
    being a single and separate person or thing
    independent; not united or joint
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  6. adjective
    common to or shared by two or more parties
    “a common friend”
    synonyms: mutual
    have in common; held or experienced in common
  7. noun
    a piece of open land for recreational use in an urban area
    synonyms: commons, green, park
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    Central Park
    a large park in Manhattan
    an amusement park in Anaheim created in 1955 by Walt Disney
    Walt Disney World
    a large amusement park established in 1971 to the southwest of Orlando
    amusement park, funfair, pleasure ground
    a commercially operated park with stalls and shows for amusement
    village green
    a village park consisting of a plot of grassy land
    theme park
    an amusement park that is organized around some theme (as the world of tomorrow)
    type of:
    parcel, parcel of land, piece of ground, piece of land, tract
    an extended area of land
  8. adjective
    of or associated with the great masses of people
    “the common people in those days suffered greatly”
    “behavior that branded him as common
    synonyms: plebeian, unwashed, vulgar
    of humble birth or origins
  9. adjective
    of low or inferior quality or value
    “produced...the common cloths used by the poorer population”
    synonyms: coarse
    of low or inferior quality
  10. adjective
    lacking refinement or cultivation or taste
    “behavior that branded him as common
    synonyms: coarse, rough-cut, uncouth, vulgar
    (used of persons and their behavior) not refined; uncouth
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