1 act, deed, effort, endeavour, enterprise, exploit, feat, measure, performance, proceeding, process, step. undertaking, work.
2 activity, drama, energy, enterprise, excitement, exercise, exertion, initiative, liveliness, motion, movement, vigour, vitality.
3 action of a play. events, happenings, incidents, story. 4 action of a watch. functioning, mechanism, operation, working, works. 5 military action.