(1):
(n.) A passage to be performed with constantly increasing volume of tone.
(2):
(a. & adv.) With a constantly increasing volume of voice; with gradually increasing strength and fullness of tone; - a direction for the performance of music, indicated by the mark, or by writing the word on the score.
(3):
(n.) A gradual increase in the strength and fullness of tone with which a passage is performed.