Relating to, dependent on, or denoting, illation; inferential; conclusive; as, an illative consequence or proposition; an illative word, as then, therefore, etc.

relating to or having the nature of illation or inference; "the illative faculty of the mind"

resembling or dependent on or arrived at by inference; "an illative conclusion"; "inferential reasoning"

a grammatical feature carried by the English connective therfore with the meaning of the logical conjunction that is probably containing, §9-1, ¶9-1-5.

Ill(CL) a clause joined to another by illative conjunction, §9-5.

An illative particle, as for, because.