Source : Webster's Revised Unabridged Dictionary (1913)

Opposite \Op"po*site\, a. [F., fr. L. oppositus, p. p. of
   opponere. See {Opponent}.]
   1. Placed over against; standing or situated over against or
      in front; facing; -- often with to; as, a house opposite
      to the Exchange.

   2. Applied to the other of two things which are entirely
      different; other; as, the opposite sex; the opposite
      extreme.

   3. Extremely different; inconsistent; contrary; repugnant;
      antagonistic.

            Novels, by which the reader is misled into another
            sort of pieasure opposite to that which is designed
            in an epic poem.                      --Dryden.

            Particles of speech have divers, and sometimes
            almost opposite, significations.      --Locke.

   4. (Bot.)
      (a) Set over against each other, but separated by the
          whole diameter of the stem, as two leaves at the same
          node.
      (b) Placed directly in front of another part or organ, as
          a stamen which stands before a petal.

Opposite \Op"po*site\, n.
   1. One who opposes; an opponent; an antagonist. [Obs.]

            The opposites of this day's strife.   --Shak.

   2. That which is opposed or contrary; as, sweetness and its
      opposite.

            The virtuous man meets with more opposites and
            opponents than any other.             --Landor.

Source : WordNet®

opposite
     adj 1: being directly across from each other; facing; "And I on the
            opposite shore will be, ready to ride and spread the
            alarm"- Longfellow; "we lived on opposite sides of the
            street"; "at opposite poles"
     2: of leaves etc; growing in pairs on either side of a stem;
        "opposite leaves" [syn: {paired}] [ant: {alternate}]
     3: moving or facing away from each other; "looking in opposite
        directions"; "they went in opposite directions"
     4: the other one of a complementary pair; "the opposite sex";
        "the two chess kings are set up on squares of opposite
        colors"
     5: altogether different in nature or quality or significance;
        "the medicine's effect was opposite to that intended"; "it
        is said that opposite characters make a union happiest"-
        Charles Reade
     6: characterized by opposite extremes; completely opposed; "in
        diametric contradiction to his claims"; "diametrical (or
        opposite) points of view"; "opposite meanings"; "extreme
        and indefensible polar positions" [syn: {diametric}, {diametrical},
         {polar}]

opposite
     n 1: two words that express opposing concepts; "to him the
          opposite of gay was depressed" [syn: {antonym}, {opposite
          word}]
     2: a relation of direct opposition; "we thought Sue was older
        than Bill but just the reverse was true" [syn: {reverse},
        {contrary}]
     3: a contestant that you are matched against [syn: {opposition},
         {opponent}]
     4: something inverted in sequence or character or effect; "when
        the direct approach failed he tried the inverse" [syn: {inverse}]

opposite
     adv : directly facing each other; "the two photographs lay
           face-to-face on the table"; "lived all their lives in
           houses face-to-face across the street"; "they sat
           opposite at the table" [syn: {face-to-face}]