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Answer for the clue "The property possessed by a rounded shape that is flattened at the poles ", 11 letters:
ellipticity

Word definitions for ellipticity in dictionaries

Wiktionary Word definitions in Wiktionary
n. 1 (context uncountable English) The condition of being elliptical (flattened from perfect circular or spherical form) 2 (context countable mathematics English) A measure of this flattening that is a function of the ellipse's equatorial and polar radius ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ellipticity \El`lip*tic"i*ty\, n. [Cf. F. ellipticit['e].] Deviation of an ellipse or a spheroid from the form of a circle or a sphere; especially, in reference to the figure of the earth, the difference between the equatorial and polar semidiameters, ...

WordNet Word definitions in WordNet
n. the property possessed by a rounded shape that is flattened at the poles; "the oblateness of the planet" [syn: oblateness ]

Usage examples of ellipticity.

So many took part in these singular experiments, which assumed rather the appearance of outdoor sports than of scientific demonstrations, that in a short time we had provided the asteroid with a very large number of little moons, or satellites, of gold, which revolved around it in orbits of various degrees of ellipticity, taking, on the average, about three-quarters of an hour to complete a circuit.