per-pupil

The adjective "per-pupil" is a modern English compound formed by combining the Latin preposition "per," meaning "for each," with the noun "pupil," meaning a student. The term "pupil" itself has a dual origin in Latin, referring both to a young ward and, metaphorically, to the tiny reflection seen in the eye, which led to its use for the central part of the eye. By the 16th century, "pupil" had evolved in English to specifically denote a person being taught. The compound "per-pupil" emerged in educational and budgetary contexts as a concise way to specify metrics—such as funding, expenditure, or ratios—that are calculated on an individual student basis, directly applying the distributive sense of "per" to the unit of the learner.

Structure: per (through, by, for each) + pupil (student, learner) - per: A Latin preposition meaning "through, by, for each." In English, it functions as a prefix to form adjectives meaning "for each" or "by each." - pupil: From Latin pupillus (a minor, ward) and pupilla (a little girl, doll; also the pupil of the eye). In English, it functions as a noun meaning "a student" or "a learner under supervision."