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Verb: hypothesise  hI'pó-thi,sIz
Usage: Brit (N. Amer: hypothesize)
  1. To believe especially on uncertain or tentative grounds
    "Scientists hypothesised that large dinosaurs lived in swamps";
    - speculate, theorize, theorise [Brit], conjecture, hypothesize, hypothecate, suppose

Derived forms: hypothesises, hypothesising, hypothesised

Type of: anticipate, expect