unidirectional

[yoo-ni-di-rek-shuh-nl, -dahy-]

u·ni·di·rec·tion·al

[yoo-ni-di-rek-shuh-nl, -dahy-]
adjective
operating or moving in one direction only; not changing direction: a unidirectional flow.

Origin:
1880–85; uni- + directional
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Unidirectional has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells.
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Collins
World English Dictionary
unidirectional (ˌjuːnɪdɪˈrɛkʃənəl, -daɪ-)
 
adj
having, moving in, or operating in only one direction

Collins English Dictionary - Complete & Unabridged 10th Edition
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