infinity (n.)youdaoicibaDictYouDict[infinity 词源字典]
late 14c., from Old French infinité "infinity; large number or quantity" (13c.), from Latin infinitatem (nominative infinitas) "boundlessness, endlessness," from infinitus boundless, unlimited" (see infinite). Infinitas was used as a loan-translation of Greek apeiria "infinity," from apeiros "endless."[infinity etymology, infinity origin, 英语词源]