ral·len·tan·do (rāl'ən-tān'dō, räl'lěn-tän'dō) adv.
& adj. Gradually slackening in tempo; ritardando. Used chiefly as a direction. n.
pl.ral·len·tan·dos A rallentando passage or movement.
[Italian, present participle of rallentare, to slow down : re-, intensive pref. (from Latin; see re-) + allentare, to slow down (from Late Latin allentāre : Latin ad-, ad- + Latin lentus, slow).]