C clef - A clef usually centered on the first line (soprano clef), third line (alto clef), fourth line (tenor clef), or third space (vocal tenor clef) of the staff. Wherever it is centered, that line or space becomes middle C.
Diminution - The shortening of note values; the opposite of augmentation.
Forte - Loud.
Grosso, grosse - Great, large.
Lento - Slow; slightly faster than largo, slower than adagio.