1. To believe especially on uncertain or tentative grounds
   - 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: theorizes, theorizing, theorized

See also: theorization, theorizer, theory

Type of: anticipate, expect, reason

• letters patent
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• Leuciscus leuciscus