1. [n]  the party who appeals a decision of a lower court
2. [adj]  of or relating to or taking account of appeals (usually legal appeals); "appellate court"

APPELLANT is a 9 letter word that starts with A.

1. \Ap*pel"lant\, a. [L. appellans, p. pr. of appellare;
   cf. F. appelant. See {Appeal}.]
   Relating to an appeal; appellate. ``An appellant
   jurisdiction.'' --Hallam.
   
   {Party appellant} (Law), the party who appeals; appellant; --
      opposed to {respondent}, or {appellee}. --Tomlins.
   
   

2. \Ap*pel"lant\, n.
   1. (Law)
      (a) One who accuses another of felony or treason. [Obs.]
      (b) One who appeals, or asks for a rehearing or review of
          a cause by a higher tribunal.
   
   2. A challenger. [Obs.] --Milton.
   
   3. (Eccl. Hist.) One who appealed to a general council
      against the bull Unigenitus.
   
   4. One who appeals or entreats.