Piano (p)
soft
Forte (f)
loud
Crescendo (cresc.)
Gradually becoming louder.
Decrescendo (decresc.)
Gradually becoming softer
Diminuendo (dim.)
Gradually becoming softer.
Adagio
Slow
Andante
An easy walking pace
Moderato
At a moderate speed. 
Allegro
Lively and fast.
Presto
Very fast
Accelerando (accel.)
Gradually becoming faster. 
Rallentando (rall.)
Gradually becoming slower.
Ritardando (ritard.)
Gradually becoming slower.
Ritenuto (rit.)
Immediately becoming slower.
A tempo
Return to former speed.
Legato
Smoothly, well connected.
Staccato
Separated, detached.
Pianissimo (pp)
Very soft
Fortissimo (ff)
Very loud.
Mezzo forte (mf).
Moderately loud.
Mezzo piano (mp)
Moderately soft
Largo
Very slowly and stately
Lento
Slow
Allegretto
Moderately fast
Vivace
Vivacious, lively
Vivo
Alive and spirited.
Allargando
Becoming broader, slowing down.
Piu mosso
Quicker
Meno mosso
Slower
Maestoso
Majestic
Sostenuto
Sustained
Poco
A little
Senza
Without
Cantabile
In a singing style
Leggiero
Lightly
Dal segno
Go back to the sign
Da capo al fine
From the beginning to the word ‘fine’.
Mezzo staccato
Slightly detached.
Sempre
Always