Source : Webster's Revised Unabridged Dictionary (1913)

Vice \Vice\, a. [Cf. F. vice-. See {Vice}, prep.]
   Denoting one who in certain cases may assume the office or
   duties of a superior; designating an officer or an office
   that is second in rank or authority; as, vice president; vice
   agent; vice consul, etc.

   {Vice admiral}. [Cf. F. vice-amiral.]
   (a) An officer holding rank next below an admiral. By the
       existing laws, the rank of admiral and vice admiral in
       the United States Navy will cease at the death of the
       present incumbents.
   (b) A civil officer, in Great Britain, appointed by the lords
       commissioners of the admiralty for exercising admiralty
       jurisdiction within their respective districts.

   {Vice admiralty}, the office of a vice admiral.

   {Vice-admiralty court}, a court with admiralty jurisdiction,
      established by authority of Parliament in British
      possessions beyond the seas. --Abbott.

   {Vice chamberlain}, an officer in court next in rank to the
      lord chamberlain. [Eng.]

   {Vice chancellor}.
   (a) (Law) An officer next in rank to a chancellor.
   (b) An officer in a university, chosen to perform certain
       duties, as the conferring of degrees, in the absence of
       the chancellor.
   (c) (R. C. Ch.) The cardinal at the head of the Roman
       Chancery.

   {Vice consul} [cf. F. vice-consul], a subordinate officer,
      authorized to exercise consular functions in some
      particular part of a district controlled by a consul.

   {Vice king}, one who acts in the place of a king; a viceroy.
      

   {Vice legate} [cf. F. vice-l['e]gat], a legate second in rank
      to, or acting in place of, another legate.

   {Vice presidency}, the office of vice president.

   {Vice president} [cf. F. vice-pr['e]sident], an officer next
      in rank below a president.

Source : WordNet®

vice admiral
     n : an admiral ranking below a full admiral and above a rear
         admiral