That one has chosen, or wishes to choose.

plural of one-of

(slang) To fart.

Using only one hand.

Synonym of nobody's fool

The quality of having a dominant hand; left-handedness or right-handedness. / Chirality / The possession of only one hand or the ability to use only one hand; the loss of the use of one hand.

(Ulster) An unpredictable person.

Alternative spelling of one drop

(chemistry) Taking place in a single reaction vessel

(idiomatic) Alone; without aid or accompaniment.