Having, or presupposing, a use of terms that is wholly determined by what falls under them (in this actual world). The meaning of a term in the extensional sense is given just by listing, or somehow indicating what things are referred to by the term. The extensional meaning of "Evening Star," "morning Star," and "Venus" is the same because they all refer to one and the same planet, though the sense, or intension, might be different. Some philosophers (see nominalist) have hoped that we could describe the world in wholly extensional terms. See intension.