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From The Collaborative International Dictionary of English v.0.48:
Oneself \One`self"\ (w[u^]n`s[e^]lf"), pron. A reflexive form of the indefinite pronoun one. Commonly written as two words, one's self. [1913 Webster] One's self (or more properly oneself), is quite a modern form. In Elizabethan English we find a man's self = one's self. --Morris. [1913 Webster]