noun
1.
Synonyms: mean 2, agency, channel, instrument, instrumentality, instrumentation, medium, ministry, organ, vehicle
Related Word: doer, executive, executor, performer; actor, worker; activator, energizer
2.
one who acts for another
diplomatic agents serving abroad
Synonyms: assignee, attorney, deputy, factor, proxy; compare delegate
Related Word: go-between, middleman; instrument, minister, tool; commissioner, proctor, procurator, representative, steward; buyer, commissionaire
Antonyms: principal
3.
Synonyms: spy , spook, undercover man