Word Study
oneself
CIDE DICTIONARY
oneself, 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." [1913 Webster]
OXFORD DICTIONARY
oneself, pron. the reflexive and (in apposition) emphatic form of one (kill oneself; one has to do it oneself).
THESAURUS
oneself
I, I myself, alter, alter ego, alterum, better self, ego, ethical self, he, her, herself, him, himself, inner man, inner self, it, me, my humble self, myself, number one, other self, ourselves, self, she, subconscious self, subliminal self, superego, them, themselves, they, you, yours truly, yourself, yourselvesROGET THESAURUS
oneself
Identity
N identity, sameness, coincidence, coalescence, convertibility, equality, selfness, self, oneself, identification, monotony, tautology, facsimile, homoousia: alter ego, ipsissima verba, same, self, very, one and the same, very thing, actual thing, real McCoy, no other, one and only, in the flesh, identical, self, ilk, the same, selfsame, one and the same, homoousian, coincide, coalescent, coalescing, indistinguishable, one, equivalent, tweedle dee and tweedle dum, much the same, of a muchness, unaltered, identically, on all fours.For further exploring for "oneself" in Webster Dictionary Online