What does postulate mean?
Postulate has two closely related uses. As a verb, it means to put forward an idea or proposition for investigation, often in a scientific, philosophical, or mathematical context: a researcher may postulate that a particular mechanism causes a disease. It can also mean to assume a proposition as a starting point for further argument, without claiming that the assumption has been proved. As a noun, a postulate is a proposition treated as a fundamental premise or self-evident principle, especially in mathematics and logic. The word is formal and conveys a careful, provisional kind of speculation. Rather than merely mentioning a possibility, postulating frames it as a specific claim whose consequences can be examined or tested. The term is therefore useful when discussing the foundational assumptions behind a theory, model, or system of reasoning.
To put forward a proposition or hypothesis for consideration, proof, or investigation; to assume a statement as the basis of an argument.
"The study postulates a direct connection between sleep and memory consolidation."
Formal; especially common in scientific, philosophical, and mathematical writing.
A proposition regarded as a fundamental assumption or self-evident starting point in an argument, especially in logic or mathematics.
"The theorem is derived from a small number of basic postulates."
Usually formal and technical; it may denote a principle accepted provisionally rather than proven.
The plural is used for distinct propositions, assumptions, or principles, particularly in logic, mathematics, and philosophy.
"These two postulates form the foundation of the model."
Postulate is a hypothesis promoted to first gear: it puts an unproven claim at the starting point so that the rest of the argument can begin.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does postulate come from?
The English word comes from Latin postulare, meaning 'to demand' or 'to ask for', and ultimately from postulatum, a request or proposition put forward. In its development, the sense shifted from making a formal request to proposing something for consideration or advancing it as an assumed principle. Related Latin forms include postulatio, 'a request or proposition', and postulatum, 'a thing claimed or demanded'. The word is cognate with postulant, a person who makes a formal application or request.
Related word forms
How postulate is actually used
Postulate is formal and most common in scientific, philosophical, and mathematical writing. It can imply that a claim is provisional rather than established, although in mathematical contexts a postulate may be adopted as an unproved starting point.
Easily confused with postulate
Postulate more explicitly presents a proposition as an assumed basis for argument or inquiry, whereas assume is the broader term for taking something to be true without proof.
A postulant is a person who formally applies for a position or membership, while postulate can refer to the proposition itself or to putting such a proposition forward.