accelerando, accel. - gradually getting quicker
adagio - slow
allegretto - fairly quick (but not as quick as allegro)
allegro - quick (literally meaning cheerful)
andante - medium ('walking' speed)
cantabile - in a singing style
crescendo, cresc. - gradually getting louder
da capo, D.C. - repeat from the beginning
dal segno, D.S. - repeat from the sign S
decrescendo, descres. - gradually getting quieter
diminuendo, dim. - gradually getting quieter
fine - the end
f, forte - loud
ff, fortissimo - very loud
legato - smoothly
lento - slow
mezzo - half
mf, mezzo forte - moderately loud (literally half loud)
mp, mezzo piano - moderately soft (litterally half quiet)
p, piano - quiet
pp, pianissimo - very quiet
poco - a little
rallentando, rall. - gradually getting slower
ritardando, rit. - gradually getting slower
ritenuto, rit. - held back
staccato, stacc. - detached
tempo - speed, time