extensional

/ɪkˈstɛnʃənəl/
adjective
  1. Relating to or involving extension, especially in logic or mathematics, where the meaning of an expression is determined by its referents or members rather than by its description.
    • The philosopher argued for an extensional definition of truth based on observable facts.
    • An extensional approach to language focuses on what words refer to in the real world.
    • In extensional logic, two sets are equal if they contain exactly the same elements.
Antonyms
What does "extensional" mean? | whatsthatwordmean | whatsthatwordmean