"Bidirectional" refers to the ability to move or operate in two opposite directions. In technology, this term is often used to describe communication systems where data can be sent and received simultaneously. For example, in a bidirectional communication system, both parties can transmit information back and forth without waiting for the other to finish. In transportation, "bidirectional" can describe roads or pathways that allow vehicles or pedestrians to travel in both directions. This is common in two-way streets, where traffic flows in opposite directions, enhancing accessibility and connectivity within urban areas.