In grammar|lang=en terms the difference between illative and elative

is that illative is (grammar) the illative case, or a word in that case while elative is (grammar) in finno-ugric languages, one of the locative cases, expressing “out of,” as in finnish talosta, hungarian ból (“out of the house”) its opposite is the illative case (“into”) in finnish, the case form is used also to express "out of" or "proximity" in a figurative sense which in english is often conveyed by the word "about" .

As nouns the difference between illative and elative

is that illative is (grammar) a word or phrase that expresses an inference (such as therefore ) while elative is (grammar) in semitic languages, the “adjective of superiority” in some languages such as arabic, the concepts of comparative and superlative degree of an adjective are merged into a single form, the elative how this form is understood or translated depends upon context and definiteness in the absence of comparison, the elative conveys the notion of “greatest”, “supreme” or elative can be (grammar) in finno-ugric languages, one of the locative cases, expressing “out of,” as in finnish talosta, hungarian ból (“out of the house”) its opposite is the illative case (“into”) in finnish, the case form is used also to express "out of" or "proximity" in a figurative sense which in english is often conveyed by the word "about" .

As an adjective illative

is of, or relating to an illation.