Familiarity is the state of knowing something very well. It's also a casual way of behaving. Your familiarity with your best friend means that you can say whatever you want around her.

Familiarity is from the Latin word familiaritatem for "intimacy, friendship.” Familiarity is used in situations that people know well. A painter has a familiarity with brushes and canvas. When there’s familiarity with a task, people aren’t stressed, because they’ve done it before. This word also refers to a casual way of acting: if you hug someone, it shows familiarity. That kind of familiarity is the opposite of aloofness and formality.

Definitions of familiarity
  1. noun
    personal knowledge or information about someone or something
    synonyms: acquaintance, conversance, conversancy
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    type of:
    knowledge acquired through study or experience or instruction
  2. noun
    usualness by virtue of being familiar or well known
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    strangeness, unfamiliarity
    unusualness as a consequence of not being well known
    type of:
    commonness by virtue of not being unusual
  3. noun
    close or warm friendship
    synonyms: closeness, intimacy
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    type of:
    a friendly disposition
  4. noun
    an act of undue intimacy
    synonyms: impropriety, indecorum, liberty
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    type of:
    misbehavior, misbehaviour, misdeed
    improper or wicked or immoral behavior
  5. noun
    a casual manner
    synonyms: casualness
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    casualness in use of language
    type of:
    a manner that does not take forms and ceremonies seriously
Word Family

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