2、来自短语at one. 与上帝一致。因宗教观念认为人带有原罪，故需赎罪。
2、atone:  As its spelling suggests, but its pronunciation disguises, atone comes from the phrase at one ‘united, in harmony’, lexicalized as atone in early modern English. It may have been modelled on Latin adūnāre ‘unite’, which was similarly compounded from ad ‘to, at’ and ūnum ‘one’.=> at, one
4、1550s, from adverbial phrase atonen (c. 1300)"in accord,"literally"at one,"a contraction of at and one. It retains the older pronunciation of one. The phrase perhaps is modeled on Latin adunare"unite,"from ad-"to, at"(see ad-) + unum"one."Related: Atoned; atoning.