We don't have synonyms for discretive yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are discretion, discrete and decretive.
(adj) :
(grammar, logic) Disjunctive with the additional characteristic that the conjoined clauses, while exhibiting a disjunct, are both asserted as true.
(adj) :
(grammar, logic) Disjunctive with the additional characteristic that the conjoined clauses, while exhibiting a disjunct, are both asserted as true.