Is one-self one word

Answer 1

The adverb is oneself, as in myself, himself, and yourself.

Example: One should attire oneself properly for formal occasions.

The form derives from the phrase one's self, where self is a noun modified by the possessive pronoun (one's). This form should only be used where the "self" is a representation of the individual's philosophical or psychological identity. You would not attire your soul or being for an occasion, as above. This form does allow for variations such as "one's own self" or "one's inner self."