The quality of being cylindrical; the degree to which something conforms to a perfect cylindrical form.
From 'cylindric' plus the suffix '-ity' (state or quality). This technical engineering and manufacturing term measures deviation from perfect cylindrical form.
In precision manufacturing, 'cylindricity' is measured in ten-thousandths of an inch, and a perfectly cylindrical component is so rare that engineers call it 'impossible to manufacture'—they aim for 'good enough' because perfect cylindricity exists only in mathematics!
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