The Collaborative International Dictionary of English v.0.48:

Prearrange \Pre`ar*range"\, v. t.
   To arrange beforehand. [Also spelled pre-arrange.]
   [1913 Webster + WordNet 1.5]

WordNet (r) 3.0 (2006):

prearrange
    v 1: arrange beforehand

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "prearrange":
   arrange, calculate, cast, clear for action, clear the decks,
   concert, contrive, cook up, cure, cut out, deploy, design, devise,
   dress, figure, fix, fix up, forecast, frame, frame up, get ready,
   intend, lay plans, make a projection, make arrangements,
   make preparations, make ready, marshal, methodize, mobilize,
   organize, pack, pack the deal, plan, plan ahead, plot, preconcert,
   precontrive, predesign, premeditate, preorder, prep, prepare,
   pretreat, process, program, project, provide, put in shape,
   rationalize, ready, ready up, rig, schedule, schematize, scheme,
   set up, settle preliminaries, sew up, shape, stack the cards,
   systematize, tan, treat, trim, try out, work out, work up