requestyoudaoicibaDictYouDict[request 词源字典]
request: [14] Request and require [14] come from the same ultimate source: Latin requīrere. This was a compound verb formed from the prefix re- ‘again’ and quaerere ‘ask, search’ (source of English enquire, question, etc). It originally meant ‘seek again, ask for again’, and it passed into Vulgar Latin as *requaerere, whose feminine past participle *requaesita has given English request. ‘Ask for’ gradually passed via ‘demand’ into ‘need’, and it was in this sense that English acquired the verb *requaerere, through Old French requere, as require.

Derivatives include requisite [15] and requisition [16].
=> enquire, inquest, query, question, requisition[request etymology, request origin, 英语词源]
request (n.)youdaoicibaDictYouDict
mid-14c., from Old French requeste (Modern French requête) "a request," from Vulgar Latin *requaesita, from Latin requisita "a thing asked for," fem. of requisitus "requested, demanded," from past participle stem of requirere (see require).
request (v.)youdaoicibaDictYouDict
1530s, from request (n.) or from Middle French requester, from Old French requester "ask again, request, reclaim," from requeste. Related: Requested; requesting.