Medical Definition of action
1: the process of exerting a force or bringing about an effect that results from the inherent capacity of an agent <protein synthesis is an expression of gene action> <insecticidal action>
2: a function or the performance of a function of the body (as defecation) or of one of its parts <the normal baby has three or four actions of the bowel in 24 hours—Morris Fishbein> <heart action>
3: an act of will
4actions plural : behavior <aggressive actions>
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