Dictionary definition for: Act
2. (v) perform an action, or work out or perform (an action) "think before you act" "We must move quickly" "The governor should act on the new energy bill" "The nanny acted quickly by grabbing the toddler and covering him with a wet towel"
4. (v) behave in a certain manner; show a certain behavior; conduct or comport oneself; "You should act like an adult" "Don''t behave like a fool" "What makes her do this way?" "The dog acts ferocious, but he is really afraid of people"
12. (v) have an effect or outcome; often the one desired or expected; "The voting process doesn''t work as well as people thought" "How does your idea work in practice?" "This method doesn''t work" "The breaks of my new car act quickly" "The medicine works on
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