Ruminations.
"Kiss" as a verb meaning "to touch with the lips" comes from Old Englishcyssan, which has the same meaning. The noun comes from Old English coss, "a kiss or embrace," and derives from the verb. The OED lists 18 different meanings for the word - 7 nouns and 11 verbs. The noun form acquired the meaning "a small piece of candy" in 1825, and "a drop of sealing wax left accidently" in 1829. An obsolete meaning for the verb is "to cause to fraternize or associate," from 1562.
"Liaison" as a noun meaning "communication which eases a close working relationship" comes from the Latinligare, "to bind." By 1806 the word gained the meaning "intimate relations." The OED lists 6 different meanings for the word - the original being "a thickening for sauces, or the process of thickening," from 1665. The first written use of the word was apparently in the writings of one Kenelm Digby, courtier and natural philosopher.