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omnidirectional

 [om-nee-di-rek-shuh-nl]   Origin

om·ni·di·rec·tion·al

   [om-nee-di-rek-shuh-nl]
adjective Electronics.
sending or receiving signals in all directions: an omnidirectional microphone.
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Origin:
1925–30; omni- + directional
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Omnidirectional is always a great word to know.
So is impedance. Does it mean:
electric circuit with resistor, inductor, capacitor and ac generator
total opposition to alternating current by an electric circuit
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Collins
World English Dictionary
omnidirectional (ˌɒmnɪdɪˈrɛkʃənəl, -daɪ-)
 
—adj
1.  (of an antenna) capable of transmitting and receiving radio signals equally in any direction in the horizontal plane
2.  (of a microphone or antenna) equally sensitive in all directions

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

omnidirectional
1927, from omni- + directional (see direction).
Online Etymology Dictionary, © 2010 Douglas Harper
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