What does a dynamic marking mean....for piano.?

pp - pianissimo - very soft

p - piano - soft

mp - mezzo-piano - medium-soft

mf - mezzo-forte - medium-loud

f- forte - loud

ff - fortissimo - very loud

cresc. - crescendo - get louder

decresc. - decrescendo - get softer

sf - sforzando - sudden accent

sfp - sforzando-piano - sudden accent and sudden piano