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a combination of -ate 1 and -or 2 that forms nouns corresponding to verbs ending in -ate 1,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, -or2.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.



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