bidirectional

This term is primarily used in technical, scientific, and mathematical registers to describe systems where movement or communication is not one-way. It carries a neutral, precise connotation, emphasizing symmetry and reciprocity in function. In computing and telecommunications, it specifically distinguishes a system from a unidirectional one, where data only flows from a source to a destination.

In linguistic or algorithmic contexts, the word describes the ability to process information from both the start to the end and the end to the start. It is rarely used in casual conversation, as simpler terms like two-way are more common in non-technical settings.