bidirectional

[bahy-di-rek-shuh-nl, -dahy-]
adjective
capable of reacting or functioning in two, usually opposite, directions.

Origin:
1940–45; bi-1 + directional

bidirectionality, noun
bidirectionally, adverb
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World English Dictionary
bidirectional (ˌbaɪdɪˈrɛkʃənəl)
 
adj
computing (of a printhead) capable of printing from left to right and from right to left

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

bidirectional
1941, from bi- + direction + -al (1). Originally of microphones.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The mixing could have been bidirectional, but the farmers were more likely to survive.
We looked at one such study of bidirectional ant traffic not so long ago.
Where a bidirectional affiliation occurs, however, the label is inappropriate.
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