An "alumnus" is a person who has graduated from a particular school, college, or university. This term is often used to refer to someone who has completed a degree or program at an educational institution. For example, a graduate of Harvard University would be considered an alumnus of that university. Alumni often maintain a connection with their alma mater, participating in events and supporting current students. Many schools have alumni associations that help former students network and stay involved. These connections can lead to opportunities in various fields, making the relationship between alumni and their institutions valuable for both parties.