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one-to-one
1 between only two people : 
tuition on a one-to-one basis
tuition on a one-to-one basis2 matching each other exactly : a one-to-one correspondence between letters and sounds
a one-to-one correspondence between letters and sounds —one-to-one adverb: I need to discuss it with him one-to-one.
I need to discuss it with him one-to-one.
