confine (n.) Look up confine at
c. 1400, "boundary, limit" (usually as confines), from Old French confins "boundaries," from Medieval Latin confines, from Latin confinium (plural confinia) "boundary, limit," from confine, neuter of confinis "bordering on, having the same boundaries," from com- "with" (see com-) + finis "an end" (see finish (v.)).
confine (v.) Look up confine at
1520s, "to border on," from Middle French confiner, from confins (n.); see confine (n.). Sense of "keeping within limits" is from 1590s. Related: Confined; confining.