Etymology
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kissing (n.)

c. 1300, verbal noun from kiss (v.). Kissage is attested from 1886.

kissing (adj.)

1580s, present-participle adjective from kiss (v.). For kissing cousin, see cousin.

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Definitions of kissing

kissing (n.)
affectionate play (or foreplay without contact with the genital organs);
Synonyms: caressing / cuddling / fondling / hugging / necking / petting / smooching / snuggling
From wordnet.princeton.edu