familiarity/fəˌmɪliˈærəti/Pluralfamiliarities1personal knowledge or information about someone or somethingSynonyms: acquaintanceconversancyconversance2usualness by virtue of being familiar or well knownAntonyms: unfamiliarity3close or warm friendshipSynonyms: intimacycloseness4an act of undue intimacySynonyms: indecorumimproprietyliberty5a casual mannerSynonyms: casualness