D defs.my
Entry 1 sense Webster, 1913

Opposability

· Op·pos·a·bil·i·ty · IPA
01 n. The condition or quality of being opposable.
  1. 1.
    The condition or quality of being opposable.
    “In no savage have I ever seen the slightest approach to opposability of the great toe, which is the essential distinguishing feature of apes.” — A. R. Wallace.