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actinal
acting
actinian
actinic
actinide
actinism
actinium
actino-
actinolite
actinometer
actinomorphic
actinomycete
actinomycin
actinomycosis
actinopterygian
actinouranium
action
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act on
act on or act upon


transitive verb 
Definition:
 
1. do as suggested: to be guided by somebody's advice or suggestion
2. have effect: to have an effect on something
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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