In linguistics: the name of a case form expressing "into". Not just "in" (that's the inessive), not just "to" (that's the allative), but "into".

In Finnish the illative has the ending -n with the preceding short vowel lengthened: talo 'house', taloon 'into the house'. Long vowels and diphthongs keep an -h- between them and the vowel ending: maa ~ maahan.

It has a number of other idiomatic uses, e.g. starting an activity (kala 'fish', menen kalaan 'I'm going fishing').

The opposite case is the elative, for motion out of.

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.


© Webster 1913.

Il"la*tive, n.

An illative particle, as for, because.


© Webster 1913.

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