<p><strong>Noun</strong></p><ul><li>Familiarity</li><li>Thorough knowledge or mastery of a thing, subject, etc.</li><li>The state of being familiar; friendly relationship; close acquaintance; intimacy.</li><li>An absence of ceremony and formality; informality.</li><li>Synonyms:<ul><li>Unconstraint</li></ul></li><li>Freedom of behavior justified only by the closest relationship; undue intimacy.</li><li>Synonyms:<ul><li>License, freedom, liberty</li></ul></li><li>Often familiarities.</li><li>An instance of such freedom, as in action or speech.</li><li>A sexual liberty or impropriety.</li></ul>