hypothecate
1. [ verb ] pledge without delivery or title of possession
Related terms: pledge
2. [ verb ] to believe especially on uncertain or tentative grounds
Synonyms: suppose speculate hypothesize theorize conjecture hypothesise theorise
Examples:

: "Scientists supposed that large dinosaurs lived in swamps."

Related terms: expect explicate reconstruct hypothesis theory hypothesis speculation guess theorist conjecture theorization supposition speculator
Similar spelling:   hypothesis
  hypothesize
  hypothesise