Oneself
Pronunciation : One`self"
Part of Speech : pron.
Definition : Defn: A reflexive form of the indefinite pronoun one. Commonly writen as two words, one's self. 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.
Source : Webster's Unabridged Dictionary, 1913