Source : Webster's Revised Unabridged Dictionary (1913)

Extreme \Ex*treme"\, n.
   1. The utmost point or verge; that part which terminates a
      body; extremity.

   2. Utmost limit or degree that is supposable or tolerable;
      hence, furthest degree; any undue departure from the mean;
      -- often in the plural: things at an extreme distance from
      each other, the most widely different states, etc.; as,
      extremes of heat and cold, of virtue and vice; extremes
      meet.

            His parsimony went to the extreme of meanness.
                                                  --Bancroft.

   3. An extreme state or condition; hence, calamity, danger,
      distress, etc. ``Resolute in most extremes.'' --Shak.

   4. (Logic) Either of the extreme terms of a syllogism, the
      middle term being interposed between them.

   5. (Math.) The first or the last term of a proportion or
      series.

   {In the extreme} as much as possible. ``The position of the
      Port was difficult in the extreme.'' --J. P. Peters.

Extreme \Ex*treme"\, a. [L. extremus, superl. of exter, extrus,
   on the outside, outward: cf. F. extr[^e]me. See {Exterior}.]
   1. At the utmost point, edge, or border; outermost; utmost;
      farthest; most remote; at the widest limit.

   2. Last; final; conclusive; -- said of time; as, the extreme
      hour of life.

   3. The best of worst; most urgent; greatest; highest;
      immoderate; excessive; most violent; as, an extreme case;
      extreme folly. ``The extremest remedy.'' --Dryden.
      ``Extreme rapidity.'' --Sir W. Scott.

            Yet extreme gusts will blow out fire. --Shak.

   4. Radical; ultra; as, extreme opinions.

            The Puritans or extreme Protestants.  --Gladstone.

   5. (Mus.) Extended or contracted as much as possible; -- said
      of intervals; as, an extreme sharp second; an extreme flat
      forth.

   {Extreme and mean ratio} (Geom.), the relation of a line and
      its segments when the line is so divided that the whole is
      to the greater segment is to the less.

   {Extreme distance}. (Paint.) See {Distance}., n., 6.

   {Extreme unction}. See under {Unction}.

   Note: Although this adjective, being superlative in
         signification, is not properly subject to comparison,
         the superlative form not unfrequently occurs,
         especially in the older writers. ``Tried in his
         extremest state.'' --Spenser. ``Extremest hardships.''
         --Sharp. ``Extremest of evils.'' --Bacon. ``Extremest
         verge of the swift brook.'' --Shak. ``The sea's
         extremest borders.'' --Addison.

Source : WordNet®

extreme
     n 1: the furthest or highest degree of something; "he carried it
          to extremes"
     2: the point located farthest from the middle of something
        [syn: {extreme point}, {extremum}]

extreme
     adj 1: of the greatest possible degree or extent or intensity;
            "extreme cold"; "extreme caution"; "extreme pleasure";
            "utmost contempt"; "to the utmost degree"; "in the
            uttermost distress" [syn: {utmost(a)}, {uttermost(a)}]
     2: far beyond a norm in quantity or amount or degree; to an
        utmost degree; "an extreme example"; "extreme
        temperatures"; "extreme danger"
     3: beyond a norm in views or actions; "an extreme
        conservative"; "an extreme liberal"; "extreme views on
        integration"; "extreme opinions"
     4: most distant in any direction; "the extreme edge of town"