circularnessn.

/ˈsəːkjʊlənɪs/Etymology: formed as circular adj. + -ness suffix.
rare.
the world > space > shape > curvature > roundness > [noun] > circularity
a1661 T. Fuller (1662) Warw. 115 In forme..in a Map it [sc. Warwickshire] doth pretend to some Circularness.
This entry has not yet been fully updated (first published 1889; most recently modified version published online January 2018).