Wordnet 3.0
ADJECTIVE (1)
1. 
 involving three parties or elements; 
- Example: "a tripartite treaty"- Example: "a tripartite division"- Example: "a three-way playoff"[syn: tripartite, three-party, three-way]
WordNet (r) 3.0 (2006):
three-party
    adj 1: involving three parties or elements; "a tripartite
           treaty"; "a tripartite division"; "a three-way playoff"
           [syn: tripartite, three-party, three-way]