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extremely low frequency

noun

, Radio.
  1. any frequency between 30 and 300 hertz. : ELF, elf

extremely low frequency

noun

  1. a radio frequency or radio-frequency band below 3 kilohertz ELF
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of extremely low frequency1

First recorded in 1965–70

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extremely high frequencyextreme programming

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