1. the act of getting on or into a vehicle, ship, or aircraft
2. wooden planks or boards used as building material or covering
3. accommodation and meals provided for payment, especially at a school

1. present participle of board: getting on or into a vehicle, ship, or aircraft
2. present participle of board: covering with wooden planks or boards

Examples

• Boarding for flight 237 will begin in ten minutes.
• The old house needed new boarding on the exterior walls.
• She attended a boarding school in Vermont.
• The passengers are boarding the train now.
• They spent the weekend boarding up the windows before the storm.
• Boarding and tuition costs have increased this year.
• The crew is boarding the ship for departure.