coarticulation (n.)

in Latin, the form of com- "together, with" in compounds with stems beginning in vowels, h-, and gn-; see com-. Taken in English from 17c. as a living prefix meaning "together, mutually, in common," and used promiscuously with native words (co-worker) and Latin-derived words not beginning with vowels (codependent), including some already having it (co-conspirator).

early 15c., "a joint or joining; setting of bones," from Old French articulation, from Medieval Latin articulationem (nominative articulatio) "separation into joints," noun of action from past-participle stem of articulare "to separate (meat) into joints," also "to utter distinctly," from articulus, diminutive of artus "joint" (see article). Meaning "the uttering of articulate sounds" is from 1610s.