"to kiss (one another)," 1650s, from Latin osculatus, past participle of osculari "to kiss," from osculum "a kiss; pretty mouth, sweet mouth," literally "little mouth," diminutive of os "mouth" (see oral). Related: Osculated; osculating; osculant; osculatory.

"a kissing; a kiss," 1650s, from Latin osculationem (nominative osculatio) "a kissing," noun of action from past-participle stem of osculari "to kiss" (see osculate).