ellipticity

== English == === Etymology === From elliptic +‎ -ity. === Noun === ellipticity (countable and uncountable, plural ellipticities) (uncountable) The condition of being elliptical (flattened from perfect circular or spherical form) (countable, mathematics) A measure of this flattening that is a function of the ellipse's equatorial and polar radii ==== Derived terms ==== hypoellipticity microellipticity subellipticity === See also === oblate prolate