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very low frequency

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noun
  1. any frequency between 3 and 30 kilohertz. Abbreviation: VLF

Origin of very low frequency

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for very low frequency

very low frequency

noun
  1. a radio-frequency band or radio frequency lying between 3 and 30 kilohertzAbbreviation: VLF
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