noun: something taken as self-evident or assumed without proof as a basis for reasoning.

Mathematics, Logic. a proposition that requires no proof, being self-evident, or that is for a specific purpose assumed true, and that is used in the proof of other propositions; axiom.

a fundamental principle.

a necessary condition; prerequisite.

Synonyms

hypothecate, presuppose, conjecture.

hypothesis, theory; axiom; assumption, conjecture. [dictionary.com]

Robert Hooke

"He **postuled** for the first time the term "cell"..." Wikipedia, Postule

"The few complete specimens that have been found have 12 thorax segments. A **postule** in the middle of each axial ring may be present. Frontal margin perpendicular to the midline, but gradually curling backward further out. Tip blunt in frontal segments, ending in a short backward pointing spine for rear segments." Wikipedia, Dikelocephalus

See Also