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Definition of familiarity : 1. Anything said or done by one person to another unceremoniously and without constraint; esp., in the pl., such actions and words as propriety and courtesy do not warrant; liberties.
2. The state of being familiar; intimate and frequent converse, or association; unconstrained intercourse; freedom from ceremony and constraint; intimacy; as, to live in remarkable familiarity.

Synonyms:

tightfistedness, liaison, impropriety, presumptuousness, fellowship, experience, overconfidence, informality, incivility, forwardness, intimacy, knowledge, indecorum, improperness, comradeship, brass, audacity, affair, autonomy, sauciness, tightness, acquaintanceship, assumption, association, chumminess, impudency, attitude, niggardness, friendship, friend, nerviness, casualness, insolence, impertinence, love, comprehension, stuffiness, secretiveness, minginess, sauce, indecorousness, involvement, nerve, friendliness, chutzpah, cheekiness, brazenness, audaciousness, niggardliness, uppishness, parsimoniousness, discourtesy, disrespect, gall, parsimony, brashness, conversancy, pushiness, affaire, awareness, face, closeness, indecency, nearness, conversance, sassiness, crust, meanness, courtesy, ease, amour, rudeness, pertness, uppityness, liberty, effrontery, impudence, cognition, cheek, acquaintance, mastery, shore leave, companionship, boldness

habit, trait, conventionality, lifestyle, leaning, tendency, fixed ways, custom, temperament, acclimation, rut, mannerism, routine, addiction, wont, treadmill, second nature, way of life, regularity, disposition, daily grind, tradition, instinct

Usage examples:

• To set up in the real estate business one thing above all else is necessary, that is uncommon familiarity with the word " imagination." - "Walking-Stick Papers", Robert Cortes Holliday.
• To preserve these little details, familiar to all soldiers, and by them not thought worthy of mention to others, because of their familiarity, but still dear to them and always the substance of their " war talks," is the object of this book. - "Detailed Minutiae of Soldier life in the Army of Northern Virginia, 1861-1865", Carlton McCarthy.
• As Tarzan looked into the eyes of Monsieur Thuran he was struck by the strange familiarity of their expression. - "The Return of Tarzan", Edgar Rice Burroughs.