Akademik

calando
adv. Mus. gradually decreasing in speed and volume.
Etymology: It., = slackening

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calando
(kaˈlando, -æ-, -æ-)
[It. calando slackening, descending: cf. calade.]
A musical direction indicating that the tone is to be gradually diminished, and the rate slackened.

Useful english dictionary. 2012.