noun
a period of time when a person is serving full-time in the military or other organization
adjective
describing someone who is currently serving in the military or other organization on a full-time basis
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He was called to active duty and had to leave his civilian job to serve in the military.
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My brother is on active duty overseas and won't be able to make it home for the holidays.
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I can't hang out tonight, I'm on active duty at work until late.
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As a teacher, she is always on active duty, constantly looking out for her students' well-being.