1) Correlating exactly 2) Corresponding directly 3) Direct 4) Early AM 5) In matched pairings 6) Kind of confrontation 7) Kind of conversation 8) Kind of correspondence 9) Kind of relationship 10) Paired 11) Pairing of combatants 12) Pairing off uniquely 13) Perfectly matched 14) Perfectly matching 1) Slang for cocaine 
[Apple] One to One is a fee-based service for private training at Apple Inc. retail stores. A US$99 one year membership with purchase of a new Mac which allows the user to receive a year`s worth of Mac, iPhone, iPod, and iPad instruction. The only restriction is that users can only book one each of the three types of sessions that are inclu...
A function or map that for every possible output has only one input that yields that particular output; if f(a) = f(b), then a = b.
A function or map that for every possible output has only one input that yields that particular output; if f(a) = f(b), then a = b. 
One-to-one is slang for cocaine.
adjective used of relations such that each member of one set is associated with one member of a second set