Meaning

noun a learner who is enrolled in an educational institution

noun the contractile aperture in the center of the iris of the eye; resembles a large black dot

noun a young person attending school (up through senior high school)

originFrom Middle English pupille, from Old French pupille, from Latin pūpilla (“pupil; little girl, doll”), named because of the small reflected image seen when looking into someone's eye.

Etymology from Wiktionary, CC BY-SA 3.0