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activation (n)
active (adj)
actively (adv)
activeness (n)
activism (n)
activist (n)
activities (n)
activity (n)
actor (n)
actress (n)
actual (adj)
actuality (n)
actualize (v)
actually (adv)
actuate (v)
acuity (n)
acumen (n)
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act up (v)
Synonyms: cause trouble, be difficult, misbehave, malfunction, go wrong, be on the blink, play up

Antonym: behave
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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