concentric

From Middle English concentrik, from Middle French concentrique, from Medieval Latin concentricus, from Latin con- (“with, together”) + centrum (“circle, center”). Equivalent to con- +‎ -centric. By surface analysis, con- +‎ centre +‎ -ic.

concentric (comparative more concentric, superlative most concentric)

(geometry) Having a common center.
- 2020 August 26, Tim Dunn, “Great railway bores of our time!”, in Rail, page 45:
  Seven huge concentric semi-circular rings of stone surround the northern end, and quite rightly are Grade 2-listed by conservation body Historic England.
- 2025 February 11, Richard Clements, “First, Love Locally: JD Vance and ‘Ordo Amoris’”, in Word on Fire‎, archived from the original on 15 February 2025:
  The ordo amoris can be conceptualized as a series of concentric circles radiating outward from ourselves, beginning with loving God, who is, as Augustine put it, “closer to us than we are to ourselves,” and ending with loving the rest of the world outside our own country.
(physiology) (of a motion) in the direction of contraction of a muscle. (E.g. extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles; closing of the jaw while flexing the masseter).
Antonym: eccentric. Concentric and eccentric movements are collectively referred to as isotonic (with motion), the antonym of which is isometric (without motion).

having a common center

in the direction of contraction of a muscle

		masculine	feminine	masculine	neuter
		singular		plural
nominative- accusative	indefinite	concentric	concentrică	concentrici	concentrice
nominative- accusative	definite	concentricul	concentrica	concentricii	concentricele
genitive- dative	indefinite	concentric	concentrice	concentrici	concentrice
genitive- dative	definite	concentricului	concentricei	concentricilor	concentricelor

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