Wordnet 3.0
ADJECTIVE (1)
1. 
 involving direct communication or contact between persons or parties; 
- Example: "a person-to-person interview"- Example: "person-to-person telephone calls"ADVERB (1)
1. 
 (of two persons) in direct encounter; 
- Example: "preferred to settle the matter one-on-one"- Example: "interviewed her person-to-person"[syn: one-on-one, person-to-person]
The Collaborative International Dictionary of English v.0.48:
person-to-person \person-to-person\, person to person \person to
person\adj.
   1. By direct contact between persons.
      [WordNet 1.5 +PJC]
   2. Without intervening persons.
   Syn: face-to-face.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
person-to-person
    adv 1: (of two persons) in direct encounter; "preferred to
           settle the matter one-on-one"; "interviewed her person-
           to-person" [syn: one-on-one, person-to-person]
    adj 1: involving direct communication or contact between persons
           or parties; "a person-to-person interview"; "person-to-
           person telephone calls"