| verb | express a supposition “Let us say that he did not tell the truth” |
| verb | expect, believe, or suppose “I imagine she earned a lot of money with her new novel” |
| verb | to believe especially on uncertain or tentative grounds “Scientists supposed that large dinosaurs lived in swamps” |
| verb | take for granted or as a given; suppose beforehand “I presuppose that you have done your work” |
| verb | require as a necessary antecedent or precondition “This step presupposes two prior ones” |
| supposition | noun | a message expressing an opinion based on incomplete evidence |
| supposal | noun | a hypothesis that is taken for granted |
| thought | noun | a personal belief or judgment that is not founded on proof or certainty |
| opinion | noun | a personal belief or judgment that is not founded on proof or certainty |
| guess | noun | a message expressing an opinion based on incomplete evidence |
| guesser | noun | a person who guesses |
| speculative | adjective | not based on fact or investigation |
| speculation | noun | a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence) |
| speculator | noun | someone who makes conjectures without knowing the facts |
| theorizer | noun | someone who theorizes (especially in science or art) |
| theory | noun | a belief that can guide behavior |
| theoriser | noun | someone who theorizes (especially in science or art) |
| theorisation | noun | the production or use of theories |
| conjecture | noun | reasoning that involves the formation of conclusions from incomplete evidence |
| hypothesis | noun | a message expressing an opinion based on incomplete evidence |
| presupposition | noun | the act of presupposing; a supposition made prior to having knowledge (as for the purpose of argument) |