IPA: /ˌbaɪdəˈrɛkʃənl/
KK: /baɪˈdaɪrɛkʃənl/
Relating to something that can move or operate in two opposite directions.
The new software allows for bidirectional communication between devices.
Bidirectional → It is formed from "bi-" (meaning two) and "direction" (from Latin "directio", meaning a guiding or leading). The word "bidirectional" means having or relating to two directions, allowing movement or communication in both ways.
Think of 'two' ('bi-') directions in which something can go, which helps you remember that 'bidirectional' means it can move or communicate in both ways.