Definition of "oblateness" [ob•late•ness]

• The state of being oblate (noun)
• The degree to which something is oblate (noun)

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• "Newton's derivation of the precession from the gravitational action of the Moon and Sun raised three unresolved questions: What are the correct values for the mass of the Moon and the oblateness of the Earth?"
• "If he looked carefully, he could just see that Saturn was not a perfect disk; on either side was something that no unaided human eye had ever seen before - the slight oblateness caused by the presence of the rings."
• "I had prepared a map of its track, in which an important error of the Berliner Jahrbuch (arising from neglect of the earth's oblateness) was corrected."