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We acted in good faith – we did not know the goods were stolen.
She claims that she acted out of necessity (=because she had to).
Stop acting stupidly!
I've acted like a total idiot.
A man was seen acting suspiciously twenty minutes before the robbery.
Just act as if nothing's happened.
This is the British English definition of act. View American English definition of act.
the part of the nucleus of an atom that has a positive electrical charge