"nine-point scale for test scores," introduced by the U.S. Air Force in 1942, from sta(ndard) + nine.
updated on January 24, 2013
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。