1.
In a ~ relationship, one person deals directly with only one other person.
...~ training.
...negotiating on a ~ basis.
ADJ: ADJ n
•
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 ~ 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 ~ match between each written symbol and each distinct spoken sound.
ADJ: ADJ n