on board

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a. A long flat slab of sawed lumber; a plank.
b. A long flat slab of another material, used as a structural member.
2. A flat, rigid, often rectangular piece of material used as a surface upon which to work: a cutting board; an ironing board.
3. A flat piece of rigid material designed to display information, especially:
a. A blackboard.
b. A bulletin board.
c. A scoreboard.
d. A toteboard.
4. Sports
a. A flat piece of material designed or equipped to be ridden as a sport, especially a snowboard, skateboard, or surfboard.
b. A diving board.
c. A backboard.
5. A flat, rigid piece of material on which a game is played, such as a checkerboard or chessboard.
a. A table at which official meetings are held; a council table.
b. An organized body of administrators or investigators: a board of trustees; a board of directors.
a. A table, especially one set for serving food.
b. Food or meals considered as a whole: board and lodging.
8. boards
a. Sports The wooden structure enclosing an area for skating, such as the ice on which hockey is played, or enclosing a playing area, as for indoor soccer.
b. A theater stage.
9. Basketball A rebound.
a. An electrical-equipment panel.
b. Computers A circuit board.
11. Nautical
a. The side of a ship.
b. A leeboard.
c. A centerboard.
12. Obsolete A border or edge.
v. board·ed, board·ing, boards
1. To cover or close with boards: board up a broken window.
a. To furnish with meals in return for pay.
b. To house where board is furnished: board a horse at a stable.
a. To enter or go aboard (a vehicle or ship).
b. To allow (passengers) on board.
c. Nautical To come alongside (a ship).
4. Sports To force (an opposing hockey player) into the boards with a body check.
5. Obsolete To approach.
1. To receive meals or food and lodging as a paying customer.
2. Sports To use a snowboard, skateboard, surfboard, or similar item.
across the board
So as to affect or include all people, classes, or categories: raised taxes across the board.
on board
1. Aboard.
2. Ready to participate or be included; amenable: The entire class was on board for the excursion to the park.

[Middle English bord, from Old English.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.on board - on a ship, train, plane or other vehicleon board - on a ship, train, plane or other vehicle
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
The mate of the Cicero was seeing his friend on board. They would continue their senseless and muddled discourse in tones of profound friendship for half an hour or so at the shore end of our gangway, and then I would hear Mr.
On this supposition they came about us in two or three hours' time with ten or twelve large boats, having some of them eight, some ten men in a boat, intending, no doubt, to have come on board and plundered the ship, and if they found us there, to have carried us away for slaves.
not only were the old sails being mended, but new sails were coming on board, and bolts of canvas, and coils of rigging; in short, everything betokened that the ship's preparations were hurrying to a close.