What does concentric mean?
Concentric describes shapes or arrangements that share a single common centre while differing in size or radius. Two or more circles drawn from the same midpoint are concentric, as are nested spheres, rings, or arcs built around one shared point. The word belongs originally to the vocabulary of geometry, where precision matters, but it has spread naturally into general description because so many real-world things take this form: ripples on a pond, the annual rings inside a tree trunk, the layered walls of an ancient fortress, or traffic zones radiating out from a city's downtown. It carries a neutral, often elegant connotation, evoking order, symmetry, and expansion outward from a core. Its natural opposite is eccentric, meaning off-centre — a pairing that makes the term especially easy to remember. Writers reach for it when they want to convey that multiple things orbit, encircle, or unfold from exactly the same middle point.
adjectiveHaving a common centre, as of two or more circles, spheres, or other curved figures that share the same midpoint but differ in size.
- (Geometry) Having a common centre — used of circles, spheres, rings, or similar figures that share one midpoint.
- (Extended/figurative) Arranged in a series of rings or layers around a common point or centre, as with tree rings, onion layers, or city zones expanding outward from a core.
"The ripples spread outward in concentric circles across the surface of the pond."
"The archer's target is marked by five concentric rings, each scoring fewer points than the last toward the bullseye."
"When a tree is cut down, its trunk reveals decades of growth recorded in concentric bands."
Every time you drop a pebble in water, you're watching geometry happen — those spreading rings are one of nature's most perfect displays of concentric circles.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of concentric
Concentric derives from Latin concentricus, which itself was borrowed from the Greek phrase meaning 'having a common centre', built on kentron, the Greek word for a sharp point or pivot — the same root that gives English 'centre' and 'center'. It entered English in the early seventeenth century through scholarly and mathematical writing, alongside sibling terms like 'eccentric' and later coinages such as 'heliocentric'. Its relatives across modern English all preserve that ancient sense of a fixed point from which something is measured or around which something turns.
Related word forms
How concentric is actually used
A technical term at root but widely understood thanks to everyday images like targets and ripples; it appears frequently in geometry, architecture, engineering, and descriptive prose. It is almost always attributive or predicative describing shapes or arrangements ('concentric circles', 'the rings are concentric'). The rare noun 'concentricity' names the quality itself, chiefly in engineering contexts. British spelling may appear as 'centre'-based phrasing around it, but the word itself is spelled identically in British and American English.
Easily confused with concentric
Eccentric means off-centre or deviating from a common centre (or, figuratively, unconventional), whereas concentric means sharing exactly the same centre.