In music, brisk or rapid.n. A brisk movement; a sprightly part or strain, the quickest except presto.Special varieties of movement or style are indicated by adding other terms: as, allegro agitato, quick and with agitation; allegro assai, very quick; allegro con brio or con fuoco, quick and with spirit or intensity; allegro con moto or allegro molto, with decided quickness; allegro vivace, quick and with vivacity; allegro giusto, quick, but with steady, even movement; allegro moderato, moderately quick; allegro ma non troppo, quick, but not excessively so.