1.
In a one-to-one relationship, one person deals directly with only one other person.
...one-to-one training.
...negotiating on a one-to-one basis.
ADJ : ADJ n
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One-to-one is also an adverb.
She would like to talk to people one to one.
ADV : ADV after v
2.
If there is a one-to-one match between two sets of things, each member of one set matches a member of the other set.
In English, there is not a consistent one-to-one match between each written symbol and each distinct spoken sound.
ADJ : ADJ n