Main Entry: ex par·te Pronunciation: 'eks-'pär-tE, -tA Function: adv or adj Etymology: Medieval Latin, on behalf (of) : on behalf of or involving only one party to a legal matter and in the absence of and usually without notice to the other party ex parte motion> ex parte> —used in citations to indicate the party seeking judicial relief in a case <Ex Parte Jones, 7 U.S. 2 (1866)> —compare IN RE, INTER PARTES