Definition of oneself
1
: a person's self : one's own self
—used reflexively as object of a preposition or verb or for emphasis in various constructions It is important to have good feelings about oneself.
2
: one's normal, healthy, or sane condition or self
the need to protect oneself from danger
be oneself
: to conduct oneself in a usual or fitting manner
under such conditions one could not be oneself
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Merriam-Webster unabridged
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Time Traveler for oneself
The first known use of oneself was in 1540
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