0 a large electronic screen linked to a computer, that is used in a classroom to show information and that can be written on by touching it with a finger, special pen, etc.:
Most schools are now well equipped with interactive whiteboards.
1 a white surface that can be written on in meetings, classes, etc. and which can display the contents of a computer screen:
The publisher now makes classroom activities for the interactive whiteboard.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
