资料来源 : Webster's Revised Unabridged Dictionary (1913)

Subjunctive \Sub*junc"tive\, a. [L. subjunctivus, fr.
   subjungere, subjunctum, to subjoin: cf. F. subjonctif. See
   {Subjoin}.]
   Subjoined or added to something before said or written.

   {Subjunctive mood} (Gram.), that form of a verb which express
      the action or state not as a fact, but only as a
      conception of the mind still contingent and dependent. It
      is commonly subjoined, or added as subordinate, to some
      other verb, and in English is often connected with it by
      if, that, though, lest, unless, except, until, etc., as in
      the following sentence: ``If there were no honey, they
      [bees] would have no object in visiting the flower.''
      --Lubbock. In some languages, as in Latin and Greek, the
      subjunctive is often independent of any other verb, being
      used in wishes, commands, exhortations, etc.

资料来源 : WordNet®

subjunctive mood
     n : a mood that represent an act or state (not as a fact but) as
         contingent or possible [syn: {subjunctive}]