Bidirectional
ahd-5
adjective.
Moving or operating in two usually opposite directions.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
Moving
in two
directions
(usually opposite).
adjective.
Operating
or
functioning
in two directions (usually opposite).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
reactive or functioning or allowing movement in two usually opposite directions