theorize

from WordNet (r) 3.0 (2006)

theorize
    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}]
    2: construct a theory about; "Galileo theorized the motion of
       the stars"
    3: form or construct theories; "he thinks and theorizes all day"

from The Collaborative International Dictionary of English v.0.48

Theorize \The"o*rize\, v. i. [imp. & p. p. {Theorized}; p. pr. &
   vb. n. {Theorizing}.] [Cf. F. th['e]oriser.]
   To form a theory or theories; to form opinions solely by
   theory; to speculate.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

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

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