| speculation(noun, concept, proposition, supposition, cogitation) |
| surmise(noun, concept, proposition, supposition, cogitation) |
| thesis(noun, proposition, assumption, supposition, presumption) |
| ipse dixit(noun, expression, assumption, supposition, presumption) |
| time travel(noun, expression, form, study, science) |
| brain wave(noun, expression, concept, cogitation, conception) |
| mind's eye(noun, expression, concept, cogitation, conception) |
| affirmation(noun, assumption, supposition, presumption, presupposition) |
| apprehension(noun, concept, cogitation, conception, abstraction) |
| assertion(noun, assumption, supposition, presumption, presupposition) |
| avouchment(noun, assumption, supposition, presumption, presupposition) |
| axiom(noun, assumption, supposition, presumption, presupposition) |
| basis(noun, assumption, supposition, presumption, presupposition) |
| brainchild(noun, concept, cogitation, conception, abstraction) |
| brainstorm(noun, concept, cogitation, conception, abstraction) |
| canon(noun, assumption, supposition, presumption, presupposition) |
| caprice(noun, concept, cogitation, conception, abstraction) |
| chimera(noun, concept, cogitation, conception, abstraction) |
| cogitation(noun, concept, conception, abstraction) |
| cognition(noun, concept, cogitation, conception, abstraction) |