What does noncircular mean?
Noncircular means not circular: literally, not shaped like a circle, or more technically, not forming a closed circular path. The term also has an important argumentative use. A noncircular explanation or proof reaches its conclusion without relying on the assumption or proposition that it is trying to establish. This distinguishes sound reasoning from circular reasoning, in which the conclusion is effectively used as one of its own premises. The word is therefore useful in geometry, logic, mathematics, and formal discussion, though it can sound unnecessarily technical in ordinary conversation. Although the prefix non- is often hyphenated when the complete compound is unusual or the contrast with the base word needs emphasis, standard dictionaries generally record noncircular as an open compound. Its clarity comes from combining a familiar geometric idea with the more general concept of avoiding circularity in thought and organization.
adjectiveNot circular or round. In logic and mathematics, noncircular reasoning does not depend, directly or indirectly, on the proposition it is intended to establish.
- Not circular or round in shape.
- Not involving circular reasoning; not self-referential in a way that assumes what is being proved.
- Not forming a closed cycle or returning directly to its starting point.
"The designer chose a noncircular table to make better use of the room."
"The sculpture had a deliberately noncircular outline."
"She challenged the proposal because its justification was noncircular and depended on an independently established premise."
In argument, noncircular reasoning is the principle that you should never use the answer to prove the answer.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does noncircular come from?
The word combines the prefix non-, meaning “not,” with circular, from Latin circularius, “of or relating to a circle.” The base also appears in circle, circuit, circulate, and circulatory, all from the Latin root circulus, meaning “ring” or “circle.” Noncircular emerged as a general descriptive term and later acquired specialized meanings in geometry and logic.
Related word forms
How noncircular is actually used
In technical and argumentative contexts, the word is formal and precise. Outside geometry and logic, it may sound especially formal when describing a shape that is simply not round.