Familiarity n. : 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.

Familiarity n. : 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.

Example:
What famous expert is credited with increasing Subetians’ Familiarity with one of the planet’s original prehis?

Taxonomy
familiarity, Merriam-Webster Online Dictionary, Dictionary, webster, iar, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, glossary, english, language, ESL, ty, a-r, Inflected, ties, 13th century, state of being.

Defination from the web:
familiarity from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "familiarity" Learn more about "familiarity" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: ...