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Concentric circles

Alternative forms[edit]


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)

  1. (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.
  2. (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).


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