kissing (Noun) — Affectionate play (or foreplay without contact with the genital organs).
kissing (Verb) — Touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.. ex. "The newly married couple kissed" ex. "She kissed her grandfather on the forehead when she entered the room"
kissing (Verb) — Touch lightly or gently. ex. "the blossoms were kissed by the soft rain"