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Verb: theorize  'thee-u,rIz
  1. To believe especially on uncertain or tentative grounds
    "Scientists theorized that large dinosaurs lived in swamps";
    - speculate, theorise [Brit], conjecture, hypothesize, hypothesise [Brit], hypothecate, suppose
     
  2. Construct a theory about
    "Galileo theorized the motion of the stars";
    - theorise [Brit]
     
  3. Form or construct theories
    "he thinks and theorizes all day";
    - theorise [Brit]

Derived forms: theorized, theorizing, theorizes

Type of: anticipate, expect, reason