1540s, one's self, "a person's self" (without distinction of gender), an emphatic form of one, with self. Hyphenated 18c.; written as one word from c. 1827, on model of himself, herself, myself, itself, etc.
one-liner
oneness
one-of-a-kind
one-off
onerous
oneself
one-shot
one-sided
one-stop
one-time
one-upsmanship
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