1. close acquaintance with or knowledge of something: "increase customer familiarity with a product"Similaracquaintance withacquaintanceship withawareness ofexperience ofinsight intoconversancy withconversance withknowledge ofunderstanding ofcomprehension ofcognizance ofgrasp ofmastery ofskill withskill inproficiency inexpertise in
▪ the quality of being well known; recognizability based on long or close association: "the reassuring familiarity of his parents' home"Similarordinarinesscustomarinessnormalityconventionality
Word OriginMiddle English (in the senses ‘close relationship’ and ‘sexual intimacy’): via Old French from Latin familiaritas, from familiaris ‘familiar, intimate’ (see familiar).