Source : Webster's Revised Unabridged Dictionary (1913)

Aboveboard \A*bove"board`\, adv.
   Above the board or table. Hence: in open sight; without
   trick, concealment, or deception. ``Fair and aboveboard.''
   --Burke.

   Note: This expression is said by Johnson to have been
         borrowed from gamesters, who, when they change their
         cards, put their hands under the table.

Source : WordNet®

aboveboard
     adj : without concealment or deception; honest; "their business
           was open and aboveboard"; "straightforward in all his
           business affairs" [syn: {straightforward}]
     adv : in an honest manner; "in he can't get it honestly, he is
           willing to steal it"; "was known for dealing aboveboard
           in everything" [syn: {honestly}] [ant: {dishonestly}]