adagio (adv.)

c. 1746, in music, "slowly, leisurely and gracefully," Italian, a contraction of ad agio, from ad "to, at" (see ad-) + agio "leisure," from Vulgar Latin *adiacens, present participle of adiacere "to lie at, to lie near" (compare adjacent). In noun sense of "a slow movement," first attested 1784.