The Collaborative International Dictionary of English v.0.48:

Bookkeeper \Book"keep`er\, n.
   One who keeps accounts; one who has the charge of keeping the
   books and accounts in an office.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bookkeeper
    n 1: someone who records the transactions of a business

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "bookkeeper":
   CA, CPA, abacist, accountant, accountant general, actuary,
   amanuensis, archivist, auditor, bank accountant, bank examiner,
   bursar, calculator, cashier, cashkeeper,
   certified public accountant, chamberlain, chartered accountant,
   clerk, comptroller, computer, controller, cost accountant,
   cost keeper, curator, depositary, depository, documentalist,
   engraver, estimator, figurer, filing clerk, financial officer,
   journalizer, librarian, liquidator, marker, notary, notary public,
   paymaster, prothonotary, purse bearer, purser, receiver, reckoner,
   record clerk, recorder, recordist, register, registrar,
   scorekeeper, scorer, scribe, scrivener, secretary, statistician,
   stenographer, steward, stonecutter, timekeeper, treasurer,
   trustee