IPA: /əˈlʌmnəs/
KK: /əˈlʌmnəs/
A man who has completed his studies at a school, college, or university, or someone who has previously attended a particular educational institution.
He is an alumnus of Harvard University.
Alumnus → It is formed from "alere" (meaning to nourish) and the suffix "-nus" (indicating belonging or relation). The word "alumnus" originally referred to someone who has been nourished or fostered, particularly in the context of education, indicating a former student of a school or university.
Think of someone who has been 'nourished' ('alere') by their education, which is why an alumnus is a former student.