Definition of: quaver

(kwā′vər) v.i.
1. To tremble or shake: said usually of the voice.
2. To produce trills or quavers in singing or in playing a musical instrument.
—v.t.
3. To utter or sing in a tremulous voice. See synonyms under QUAKE, SHAKE.
—noun
1. A quivering or tremulous motion.
2. A shake or trill, as in singing.
3. An eighth note. [Freq. of obs. quave, ME cwafian tremble]
—qua′·ver·y adjective