one-to-one ( synonym found)
Definition of one-to-one:

(n) : a personal relationship, especially a sexual one, between two people. Colloquial abbreviation: 121 or 1-2-1; injection; a mapping which takes no two points in the preimage to the same point in the image
Definition of one-to-one:

(n) : a personal relationship, especially a sexual one, between two people. Colloquial abbreviation: 121 or 1-2-1; injection; a mapping which takes no two points in the preimage to the same point in the image
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