familiarity

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

n personal knowledge or information about someone or something

Synonyms:
acquaintance, conversance, conversancy
Type of:
information
knowledge acquired through study or experience or instruction

n usualness by virtue of being familiar or well known

Antonyms:
strangeness, unfamiliarity
unusualness as a consequence of not being well known
Type of:
usualness
commonness by virtue of not being unusual

n close or warm friendship

Synonyms:
closeness, intimacy
Type of:
friendliness
a friendly disposition

n an act of undue intimacy

Synonyms:
impropriety, indecorum, liberty
Type of:
misbehavior, misbehaviour, misdeed
improper or wicked or immoral behavior

n a casual manner

Synonyms:
casualness
Types:
slanginess
casualness in use of language
Type of:
informality
a manner that does not take forms and ceremonies seriously

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