Oxford Advanced American Dictionary

Definition of quaver noun from the Oxford Advanced Learner's Dictionary

quaver

noun
quaver pronunciation English ˈkweɪvə(r) quaver pronunciation American ˈkweɪvər
 
1 (British English) (North American English eighth note) (music) a note that lasts half as long as a crotchet/quarter note2 [usually singular] a shaking sound in somebody's voice