extensionally

/ɪkˈstɛnʃənəli/
adverb
  1. In a way that relates to or is based on extension, especially by referring to actual objects or members rather than to descriptions or meanings.
    • The two theories are extensionally equivalent if they make the same predictions about observable events.
    • The programmer checked whether the two functions behaved extensionally the same for all inputs.
    • We can define the word 'dog' extensionally by listing all individual dogs.
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