What is the meaning of the word "board"?

Definitions:

A group of people constituted as the decision-making body of an organization. NOUN
- The board had seven members.
A horizontal surface on which to cut things, play games, or perform other activities. NOUN
- Pete set out the puzzle pieces on the board.
A long, thin, flat piece of wood or other hard material, used for floors and other building purposes. NOUN
- They nailed boards across the windows to prepare for the storm.
A qualifying examination, esp. one for admission to an academic program. NOUN
- She wanted to go to Harvard, so she took the college board exam.
A vertical surface on which information can be displayed to public view. NOUN
- There was a 'For Sale' board outside the house.
A vertical surface on which to write or pin notices. NOUN
- The teacher wrote the exercised on the board.
Get on or into a ship, aircraft, or other vehicle. VERB
- We should hurry up and board the ship.
The provision of regular meals when one stays somewhere in return for payment of services. NOUN
- She had to pay room and board in order to live in the dorm at the university.
To live and take one's meals at or in. VERB
- I board in the university dorms.
To lodge and take meals at. VERB
- I board with a family in town during the semester.
To provide food and lodging for. VERB
- The room and board fees were $50 a week.
- We are boarding three people right now.