Il″la‐tive (?), a. [L. illativus: cf. F. illatif.] Relating to, dependent on, or denoting, illation; inferential; conclusive; as, an illative consequence or proposition; an illative word, as then, therefore, etc.
Illative conversion(Logic), a converse or reverse statement of a proposition which in that form must be true because the original proposition is true. — Illative sense(Metaph.), the faculty of the mind by which it apprehends the conditions and determines upon the correctness of inferences.