Definition: a hypothetical possibility, circumstance, statement, proposal, situation, etc.
Usage: consider the following, just as a hypothetical
Definition: a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
Usage: a scientific hypothesis that survives experimental testing becomes a scientific theory; he proposed a fresh theory of alkalis that later was accepted in chemical practices
Definition: based primarily on surmise rather than adequate evidence
Usage: theories about the extinction of dinosaurs are still highly conjectural; the supposed reason for his absence; suppositious reconstructions of dead languages; hypothetical situation
Definition: concerned primarily with theories or hypotheses rather than practical considerations
Usage: theoretical science