Definition of "extensional" [ex•ten•sion•al]

• Of or pertaining to extension. (adjective)
• Having great extent. (adjective)

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• "What I call extensional self defense mirrors penal code statues in California and other states, known as the “necessity defense.”"
• "x and y have precisely the same members they are said to have the same extension, and sets are often called extensional entities."
• "If one likes, this could be called extensional self defense, since humans are acting on behalf of animals who are so vulnerable and oppressed they cannot fight back to attack or kill their oppressors."