Synonyms: vibration, quiver, quivering
Definition: the act of vibrating
Similar words: motility, motion, move, movement
Definition: a change of position that does not entail a change of location
Usage: the reflex motion of his eyebrows revealed his surprise; movement is a sign of life; an impatient move of his hand; gastrointestinal motility
Synonyms: palpitation, trembling, quiver, quivering, shakiness, shaking, vibration
Definition: a shaky motion
Usage: the shaking of his fingers as he lit his pipe