D defs.my
Entry 1 sense Webster, 1913

Externality

· Ex·ter·nal·i·ty · IPA /ɛkstɚˈnælɪti/
01 n. State of being external; exteriority
  1. 1.
    State of being external; exteriority(Metaph.)
    “Pressure or resistance necessarily supposes externality in the thing which presses or resists.” — A. Smith.