A one-on-one situation, meeting, or contest involves only two people.
...a one-on-one therapy session.
= one-to-one
ADJ: usu ADJ n
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One-on-one is also an adverb.
Talking one-on-one with people is not his idea of fun.
ADV: ADV after v
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One-on-one is also a noun.
Holloway was beaten in a one-on-one with Miklosko just before half-time.
N-SING: oft N with n