VERTICITY
Source: 566, 567
verticity. Verticity, n. the act of turning about, a rotation
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Ver‐tic″i‐ty (?), n. [[Cf. F. verticité. See Vertex.]] The quality or power of turning; revolution; rotation. Locke. I hardly believe he hath from elder times unknown the verticity of the loadstone. Sir T. Browne.