Rallentando

[rælen'tændәu]

(adj.) gradually decreasing in tempo .

(adv.) slowing down; 'this passage should be played rallentando'.

Edited by Babbage--From WordNet

(a.) Slackening; -- a direction to perform a passage with a gradual decrease in time and force; ritardando.

Edited by Jason

adj. (mus.) becoming slower.—Also Rallenta′to and abbrev. Rall.

Edited by Lancelot