ellipticity

noun
el·​lip·​tic·​i·​ty | \i-ˌlip-ˈti-sə-tē, (ˌ)e-\

Definition of ellipticity 

: deviation of an ellipse or a spheroid from the form of a circle or a sphere

First Known Use of ellipticity

1753, in the meaning defined above

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The first known use of ellipticity was in 1753

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