Source : Webster's Revised Unabridged Dictionary (1913)

Trivial \Triv"i*al\, a. [L. trivialis, properly, that is in, or
   belongs to, the crossroads or public streets; hence, that may
   be found everywhere, common, fr. trivium a place where three
   roads meet, a crossroad, the public street; tri- (see {Tri-})
   + via a way: cf. F. trivial. See {Voyage}.]
   1. Found anywhere; common. [Obs.]

   2. Ordinary; commonplace; trifling; vulgar.

            As a scholar, meantime, he was trivial, and
            incapable of labor.                   --De Quincey.

   3. Of little worth or importance; inconsiderable; trifling;
      petty; paltry; as, a trivial subject or affair.

            The trivial round, the common task.   --Keble.

   4. Of or pertaining to the trivium.

   {Trivial name} (Nat. Hist.), the specific name.

Trivial \Triv"i*al\, n.
   One of the three liberal arts forming the trivium. [Obs.]
   --Skelton. Wood.

Source : WordNet®

trivial
     adj 1: (informal terms) small and of little importance; "a fiddling
            sum of money"; "a footling gesture"; "our worries are
            lilliputian compared with those of countries that are
            at war"; "a little (or small) matter"; "Mickey Mouse
            regulations"; "a dispute over niggling details";
            "limited to petty enterprises"; "piffling efforts";
            "giving a police officer a free meal may be against
            the law, but it seems to be a picayune infraction"
            [syn: {fiddling}, {footling}, {lilliputian}, {little},
             {Mickey Mouse}, {niggling}, {piddling}, {piffling}, {petty},
             {picayune}]
     2: obvious and dull; "trivial conversation"; "commonplace
        prose" [syn: {banal}, {commonplace}]
     3: of little substance or significance; "a few superficial
        editorial changes"; "only trivial objections" [syn: {superficial}]
     4: concerned with trivialities; "a trivial young woman"; "a
        trivial mind"
     5: not large enough to consider or notice [syn: {insignificant}]