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

Derived forms: theorised, theorising, theorises

Type of: anticipate, expect, reason