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
