Definition
A method of communication between two electronic devices or systems in which data can flow in both directions over the same connection, allowing each side to both send and receive information.
Plain English
A two-way data link. Each device can talk and listen on the same connection, instead of only sending or only receiving.
Context Anchor
Seen in avionics, aircraft computer systems, electronic displays, and maintenance connections where one unit exchanges information with another.
Derivation
From Latin 'bi-' meaning two, and 'directio' meaning direction. So 'bidirectional' simply means 'in two directions' — data moves both ways across the link.
Why Pilots Care
Enables real-time updates between aircraft systems without one-way limitations, improving situational awareness and system coordination.
Analogy
Like a phone call rather than a radio broadcast — both ends can speak and listen on the same line.
Intuition Check
Bidirectional does not necessarily mean information is moving both ways at the exact same instant. It means both connected sides are capable of sending and receiving information.
Example Sentence 1
The flight management system uses a bidirectional data transfer with the ground station, sending position reports and receiving updated route information.
Example Sentence 2
ADS-B In and Out together provide bidirectional data transfer between aircraft and ground stations.