What does nonplanar mean?
Nonplanar is a technical adjective meaning that something does not lie in a single plane. The word is especially common in geometry and graph theory, where it describes figures, points, surfaces, or graphs that cannot be represented in one flat plane without losing their essential structure. It also appears in chemistry and engineering when describing molecular shapes, three-dimensional components, or structures whose arrangement affects their properties. Nonplanar is the natural counterpart to planar: a planar object is flat or confined to one plane, while a nonplanar object extends beyond it. Although the word has a strongly academic tone, it can be useful in general writing when a clear contrast is needed between two- and three-dimensional forms. It should not be used merely to mean unusual, irregular, or visually complicated.
adjectiveNot lying in or confined to a single plane; having a genuinely three-dimensional form. In geometry, it describes points, figures, surfaces, or objects that do not share one plane.
- Not lying in or confined to a single plane; having a genuinely three-dimensional form.
"The nonplanar structure distributes stress more evenly than a conventional flat frame."
"The molecule adopts a nonplanar conformation because of steric interactions between its substituents."
"The graph is nonplanar, so it cannot be drawn on a plane without crossings."
Nonplanar is the mathematical way of saying that a shape has escaped the flat world.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does nonplanar come from?
The word is formed in English by combining the prefix non- with planar. Planar comes through mathematical and scientific English from Latin planus, meaning “flat” or “level,” and is related to plane, planarity, and planimetry. The prefixed form developed as a natural way of expressing that an object or figure is not confined to one plane.
Related word forms
How nonplanar is actually used
A formal technical adjective used especially in mathematics, geometry, graph theory, chemistry, and engineering. It is more precise than simply saying that something is complex or irregular, and it normally contrasts with the term planar.
Easily confused with nonplanar
Planar means lying in or confined to a single plane, whereas nonplanar means not doing so.