(in English and certain other languages) noting or pertaining to a mood or mode of the verb that may be used for subjective, doubtful, hypothetical, or grammatically subordinate statements or questions, as the mood of be in if this be treason. Compare imperative (def 3), indicative (def 2).
the subjunctive mood or mode.
a verb in the subjunctive mood or form.
(grammar) denoting a mood of verbs used when the content of the clause is being doubted, supposed, feared true, etc, rather than being asserted. The rules for its use and the range of meanings it may possess vary considerably from language to language. In the following sentence, were is in the subjunctive: I'd think very seriously about that if I were you Compare indicative
(grammar) the subjunctive mood a verb in this mood