The Collaborative International Dictionary of English v.0.48:

Decide \De*cide"\, v. t. [imp. & p. p. Decided; p. pr. & vb.
   n. Deciding.] [L. dec[imac]dere; de- + caedere to cut, cut
   off; prob. akin to E. shed, v.: cf. F. d['e]cider. Cf.
   Decision.]
   1. To cut off; to separate. [Obs.]
      [1913 Webster]

            Our seat denies us traffic here;
            The sea, too near, decides us from the rest.
                                                  --Fuller.
      [1913 Webster]

   2. To bring to a termination, as a question, controversy,
      struggle, by giving the victory to one side or party; to
      render judgment concerning; to determine; to settle.
      [1913 Webster]

            So shall thy judgment be; thyself hast decided it.
                                                  --1 Kings xx.
                                                  40.
      [1913 Webster]

            The quarrel toucheth none but us alone;
            Betwixt ourselves let us decide it then. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

deciding
    adj 1: having the power or quality of deciding; "the crucial
           experiment"; "cast the deciding vote"; "the determinative
           (or determinant) battle" [syn: deciding(a),
           determinant, determinative, determining(a)]
    n 1: the cognitive process of reaching a decision; "a good
         executive must be good at decision making" [syn: decision
         making, deciding]