1949 in baseball as initialism (acronym) for earned run average. From 1971 in U.S. politics for Equal Rights Amendment.
updated on July 27, 2014
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。