1. a large dark surface, usually black or dark green, used for writing or drawing on with chalk in classrooms

Examples

• The teacher wrote the math problem on the blackboard.
• Students copied the notes from the blackboard into their notebooks.
• Please erase the blackboard before the next class.
• The old school still uses blackboards instead of whiteboards.
• She drew a diagram on the blackboard to explain the concept.
• The blackboard was covered with chalk dust after the lesson.