analogy (n.)youdaoicibaDictYouDict[analogy 词源字典]
1540s (perhaps early 15c.), from Old French analogie or directly from Latin analogia, from Greek analogia "proportion," from ana- "upon, according to" (see ana-) + logos "ratio," also "word, speech, reckoning" (see logos). A mathematical term used in a wider sense by Plato.[analogy etymology, analogy origin, 英语词源]