one-to-one


Concise Oxford English Dictionary © 2008 Oxford University Press:
one-to-one (also chiefly N. Amer. one-on-one)
adjective & adverb denoting or referring to a situation in which two parties come into direct contact or opposition.

Mathematics in which each member of one set is associated with one member of another.

noun informal a face-to-face encounter.
'one-to-one' also found in these Oxford entries:

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