Definition of "opposability" [op•pos•a•bil•i•ty]

• The condition or quality of being opposable. (noun)

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• "In a section where I remark, in relation to the opposability of the thumb, that this unique capacity has elevated us above all other mortal creatures, my purple companion asks in the margin Best word? —"
• "In considering this point, however, it must not be forgotten that the civilized great toe, confined and cramped from childhood upwards, is seen to a great disadvantage, and that in uncivilized and barefooted people it retains a great amount of mobility, and even some sort of opposability."
• "Being contrarians, we liked the opposability of both thumbs."