theorize

Verb
  1. To believe especially on uncertain or tentative grounds (synset 200635105)
    "Scientists supposed that large dinosaurs lived in swamps"
  2. Construct a theory about (synset 200634756)
    "Galileo theorized the motion of the stars"
  3. Form or construct theories (synset 200634593)
    "he thinks and theorizes all day"

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