Music Term Definitions Crescendo (cresc): Gradually increase the volume. Decrescendo (decresc. ): Gradually softer. Diminuendo (dim. ... Forte (f): Strong or loud. Fortepiano (fp): Loud then immediately soft. Fortissimo (ff): Very strong or loud. Mezzo: medium or moderately (as in mezzo piano or mezzo soprano) Morendo: Die away. More items...