The Collaborative International Dictionary of English v.0.48:

Quadripartite \Quad*rip"ar*tite\, a. [L. quadripartitus, p. p.
   of quadripartire to divide into four parts; quattuor four +
   partire to divide: cf. F. quadripartite.]
   Divided into four parts.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quadripartite
    adj 1: involving four parties [syn: quadripartite, four-
           party]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

QUADRIPARTITE. Having four parts, or divided into four parts; as, this
indenture quadripartite made between A B, of the one part, C D, of the
second part, E P, of the third part, and G H, of the fourth part.