activating ac·ti·va·ting US/ˈæktʌˌveɪtɪŋ/ uncommon noun (1) adjective (1) noun 1. the activity of causing to have energy and be active Synonymsenergizingactivation adjective 1. causing motion or action or change Synonymsactuating Similarcausative Related words Word family energize Broader terms activity Narrower terms electrificationvivification WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.