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.

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.
(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

English