The quality or state of being concentric; the condition of sharing the same center.
Noun form created from concentric by adding -ity, the standard suffix for abstract nouns. This technical term became essential in geometry and physics starting in the 17th century.
Engineers use concentricity as a precision measurement—when manufacturing engine parts, a tiny deviation from perfect concentricity can make the whole motor fail, so it's measured to fractions of millimeters.
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