reciprocalyoudaoicibaDictYouDict[reciprocal 词源字典]
reciprocal: [16] English adapted reciprocal from Latin reciprocus ‘alternating’. This was a compound adjective based ultimately on the elements re- ‘back, backwards’ and prō- ‘for, forwards’.
[reciprocal etymology, reciprocal origin, 英语词源]
reciprocal (adj.)youdaoicibaDictYouDict
1560s, with -al (1) + stem of Latin reciprocus "returning the same way, alternating," from pre-Latin *reco-proco-, from *recus (from re- "back;" see re-, + -cus, adjective formation) + *procus (from pro- "forward;" see pro-, + -cus. Related: Reciprocally. The noun meaning "that which is reciprocal" (to another) is from 1560s.