A former student or pupil of a school, college, or university is referred to as an alumnus (masculine, plural alumni) or alumna (feminine, plural alumnae). The term usually, but not always, refers to a graduate of the academic institution in question. One can be an alumnus without graduating. A former employee or member of an organization, benefactor, or inmate are all examples of the expression.
The phrase is sometimes abbreviated to “alum” or plural “alums”.
Alumni reunions are significant gatherings at most colleges and universities. They are often organized by alumni organizations and are generally social fundraising events.