1831, back-formation from locomotion.
1640s, "action or power of motion," from Latin loco "from a place" (ablative of locus "a place;" see locus) + motionem (nominative motio) "motion, a moving" (see motion (n.)). From 1788 as "movement from place to place."
updated on April 04, 2012
英语词源词典收录了45867条英语词源词条，基本涵盖了全部常用英语词汇的起源、历史，是研究英语词汇或通过词源学英语的必备工具。