opposability

opposable

[uh-poh-zuh-buhl]
adjective
1.
capable of being placed opposite to something else: the opposable thumb of primates.
2.
capable of being resisted, fought, or opposed.

Origin:
1660–70; oppose + -able

opposability, noun
nonopposable, adjective
unopposable, adjective
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World English Dictionary
opposable (əˈpəʊzəbəl)
 
adj
1.  capable of being opposed
2.  Also: apposable (of the thumb of primates, esp man) capable of being moved into a position facing the other digits so as to be able to touch the ends of each
3.  capable of being placed opposite something else
 
op'posably
 
adv
 
opposa'bility
 
n

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

opposable
1833, in reference to thumbs, from oppose + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
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