pi·a·no 2 
(pē-änō, pyä-) Music
(pē-änō, pyä-) Music adv. & adj. Abbr. p
In a soft or quiet tone. Used chiefly as a direction.
n. pl. pi·a·nos
A passage to be played softly or quietly.
[Italian, from Late Latin plānus, smooth, graceful, from Latin, flat; see pelə-2 in the Appendix of Indo-European roots.]