Source : Webster's Revised Unabridged Dictionary (1913)

Uttermost \Ut"ter*most`\, n.
   The utmost; the highest or greatest degree; the farthest
   extent. --Tennyson.

         Wherefore he is able also to save them to the uttermost
         that come unto God by him.               --Heb. vii.
                                                  25.

         He cannot have sufficient honor done unto him; but the
         uttermost we can do, we must.            --Hooker.

Uttermost \Ut"ter*most\, a. [From {Utter}, a.; cf. {Utmost}, and
   {Outermost}.]
   Extreme; utmost; being; in the farthest, greatest, or highest
   degree; as, the uttermost extent or end. ``In this uttermost
   distress.'' --Milton.

Source : WordNet®

uttermost
     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: {extreme}, {utmost(a)}, {uttermost(a)}]
     2: (comparatives of `far') most remote in space or time or
        order; "had traveled to the farthest frontier"; "don't go
        beyond the farthermost (or furthermost) tree"; "explored
        the furthest reaches of space"; "the utmost tip of the
        peninsula" [syn: {farthermost}, {farthest}, {furthermost},
         {furthest}, {utmost}]
     n : the greatest possible degree; "he tried his utmost" [syn: {utmost},
          {maximum}, {level best}]