noun, plural concavities for 2.
the state or quality of being concave.
a concave surface or thing; cavity.

1350–1400; Middle English concavite < Late Latin concavitāt- (stem of concavitās). See con-, cave, -ity

subconcavity, noun, plural subconcavities. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
concavity (kɒnˈkævɪtɪ)
n , pl -ties
1.  the state or quality of being concave
2.  a concave surface or thing; cavity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 15c., from Fr. concavité (14c.), from L. concavitas, from concavus "hollow" (see concave).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

concavity con·cav·i·ty (kŏn-kāv'ĭ-tē)
A hollow or depression that is curved like the inner surface of a sphere.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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