hypothesize

from WordNet (r) 3.0 (2006)

hypothesize
    v 1: to believe especially on uncertain or tentative grounds;
         "Scientists supposed that large dinosaurs lived in swamps"
         [syn: {speculate}, {theorize}, {theorise}, {conjecture},
         {hypothesize}, {hypothesise}, {hypothecate}, {suppose}]

from Moby Thesaurus II by Grady Ward, 1.0

20 Moby Thesaurus words for "hypothesize":
      analyze, apply reason, deduce, entertain a theory,
      espouse a theory, generalize, have a theory, infer,
      intellectualize, logicalize, logicize, philosophize,
      provide a rationale, rationalize, reason, speculate, syllogize,
      synthesize, theorize, use reason

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