出典:Wiktionary
From Middle English whil er, whileere [and other forms], whilom er (“some while ago または before, formerly”), from 古期英語 hwīle ǣr, hwīlum ǣr,[1] from hwīle (accusative singular of hwīl), hwīlum (“at some time in the past, once; sometimes”) (dative plural of hwīl (“period of time, a while”), ultimately from Proto-Indo-European *kʷyeh₁- (“to rest; peace, rest”)) + ǣr (“before”) (ultimately from Proto-Germanic *airiz (“before, earlier”)). The English word is analysable as while + ere.[2]
whilere (not comparable)