Origins
The word 'alumnus' entered English in the 1640s directly from Latin, where it meant 'a nursling,' 'a foster child,' or 'a pupil.' It derives from the Latin verb 'alere' (to nourish, to feed, to rear, to sustain), and its original sense is concrete and physical: an alumnus is someone who has been nourished, fed, and raised. The application to education extends this metaphor: the school nourishes the student's mind as a parent nourishes a child's body.
Latin 'alere' traces to Proto-Indo-European *h₂el- (to grow, to nourish), a root of wide distribution. In Latin alone, it produced 'alimentum' (food, nourishment — whence English 'aliment' and 'alimentary'), 'altus' (high, deep — literally 'grown tall,' whence 'altitude,' 'alto,' 'exalt,' and 'altar'), 'almus' (nourishing, bountiful — used in the phrase 'alma mater'), 'adolēscere' (to grow up — whence 'adolescent'), and 'adultus' (grown up — whence 'adult'). Through the Germanic branch, the same PIE root produced Proto-Germanic *aldaz (grown, old), giving Old English 'eald' and modern English 'old' — something that has grown through time.
The connection between 'alumnus' and 'old' is thus genuine: both words spring from the same PIE root meaning 'to grow.' An alumnus is one who has been grown (nourished, reared); something old is something that has grown (aged). The semantic paths diverge — nourishment versus aging — but the origin is shared.
Latin Roots
The Latin gendered forms have created a minor grammatical complication in English. The masculine singular is 'alumnus,' the feminine singular 'alumna,' the masculine (or mixed) plural 'alumni,' and the feminine plural 'alumnae.' American universities have traditionally used these distinctions, particularly in alumni associations. In recent decades, the gender-neutral abbreviated form 'alum' (plural 'alums') has gained currency, and some institutions have adopted 'alumni' as a gender-neutral collective. The Latinate 'alumnus/alumna' distinction persists in formal contexts.
The companion phrase 'alma mater' (nourishing mother) uses the feminine adjective 'alma' from the same root 'alere.' The phrase was originally a Roman epithet for various goddesses — Ceres, Cybele, Venus — in their role as nurturing, life-giving forces. Medieval European universities adopted it to describe the institution that nourished its students. The pairing of 'alma mater' and 'alumnus' creates a complete metaphorical system: the school is the mother, the student is the nursling, and education is the nourishment that passes between them.
This conceptualization of education as feeding has deep roots in Western thought. Plato and Aristotle used nurture metaphors for intellectual development. The Latin 'ēducāre' (to educate) is itself related to 'ēducere' (to lead out, to draw forth), but the 'alumnus' metaphor emphasizes the opposite direction: not drawing out what is within the student but pouring in nourishment from outside.
Modern Legacy
In contemporary American English, 'alumni' has become a standard collective term for former students and graduates, used in university fundraising, networking, and institutional identity. The alumni network — a community of former students who remain connected to their institution and to each other — is a significant feature of American higher education culture. The word's Latin gravity lends institutional weight to what is, at bottom, a claim of family: we who were nourished together remain kin.