Alumnus (noun)

1. A former student of a school, college, or university.
2. A male former student.

Origin:

Late 19th century: from latin, 'pupil, foster-son', past participle of alere 'to nourish'.

Examples:

1. The alumni association held a reunion for all alumni from the class of 1995.
2. The alumnus was proud to donate to his alma mater.
3. The alumnus was pleased to return to his former school for a visit.
4. The alumnus was recognized for his achievements at the alumni awards ceremony.
5. The alumnus returned to campus to speak to current students about his career experiences.