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Meaning of -ator

-ator

Pronunciation: [key]
  1. a combination of and that forms nouns corresponding to verbs ending in,denoting a human agent (agitator; mediator; adjudicator) or nonhuman entity, esp. a machine (incubator; regulator; vibrator) performing the function named by the verb. Cf. -tor, -or.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.