A1 a surface on the wall of a classroom that a teacher writes on

A2 a piece of wood, plastic, etc. on a wall where information can be put

A2 a flat piece of wood, cardboard, etc. for playing games on

› a flat object or surface used for a particular purpose

› a long, thin, flat piece of wood

› [ no plural ] UK meals that are provided when you stay in a hotel

› [ no plural ] US meals that are provided to the students who live at a school, college, or university

› a group of people who control a company

B1 to get on a bus, boat, or plane

› If a plane or train is boarding, passengers are getting onto it