The Collaborative International Dictionary of English v.0.48:

Accountant \Ac*count"ant\, n. [Cf. F. accomptant, OF. acontant,
   p. pr.]
   1. One who renders account; one accountable.
      [1913 Webster]

   2. A reckoner.
      [1913 Webster]

   3. One who is skilled in, keeps, or adjusts, accounts; an
      officer in a public office, who has charge of the
      accounts.
      [1913 Webster]

   Accountatn general, the head or superintending accountant
      in certain public offices. Also, formerly, an officer in
      the English court of chancery who received the moneys paid
      into the court, and deposited them in the Bank of England.
      [1913 Webster]