Entry 1 sense Webster, 1913 kissing cousin · kiss·ing cous·in · IPA /ˌkɪsɪŋ ˈkʌz(ə)n/ 01 A cousin sufficiently well acquainted to be greeted with a kiss; a type of kissing kin. 1. A cousin sufficiently well acquainted to be greeted with a kiss; a type of kissing kin.