1) Italian words and phrase 2) Italian musical term 3) Low loudness 4) Musical term in Rome 5) Musical term to an Italian 6) Piano 7) So as barely to be heard 8) Soft 9) To be played very softly 10) Very quietly 11) Very soft 12) Very soft, musically 13) Very softly 14) Very gentle but in Italian 15) Very gentle in Italian 1) Piano 
Pianissimo is an Italian word, meaning `very soft`. It can mean: ...
• (a.) Very soft; -- a direction to execute a passage as softly as possible. (Abbrev. pp.)
(from the article `Italian literature`) ...new expression: some, like the futuristi, had tried to work rhetoric out of their system by letting it run amok; others, such as Camillo Sbarbaro ...
Pi`a·nis'si·mo adjective [ Italian , superl. of piano .] (Mus.) Very soft; -- a direction to execute a passage as softly as possible. (Abbrev. pp .) 
pianissimo 
In music, pianissimo is a direction to execute a passage as softly as possible.
Very soft. Pianissimo is indicated by the marking: pp
[adj] - chiefly a direction or description in music 2. [adv] - a direction in music
Italian dynamic marking for “very soft.”
adjective chiefly a direction or description in music; very soft
extremely soft
a musical term meaning very softly.
pp, very soft