Aboard 5 : The inside of a ship: hence any person who enters a ship is said to go aboard: but when an enemy enters in the time of battle, he is said to board. A phrase which always, implies hostility
William Falconer's Dictionary of the Marine, Glossary, Published by South Seas using the Web Academic Resource Publisher, London 1780. (http://threedecks.org/index.php?display_type=glos sary, (Mrtm - Brit) {583}