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- (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).
- (physiology): eccentric
having a common center