Alumnus
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Gender Variants
Alumnus is traditionally male. The female equivalent is alumna, and plural is alumni for mixed or male-only groups and alumnae for females. She was an alumna of Oxford University, and he was an alumnus.
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Not Current Students
Use alumnus only for someone who has graduated, not for current students. Once you graduate, you'll be an alumnus of our college.
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Specific Institutions
Alumnus refers to someone from a specific school, not someone who just attended school in general. As an alumnus of Yale, he often visits for reunions.