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extremely low frequency

American

noun

Radio.

any frequency between 30 and 300 hertz. ELF, elf

extremely low frequency British

noun

ELF. a radio frequency or radio-frequency band below 3 kilohertz

"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

Etymology

Origin of extremely low frequency

First recorded in 1965–70

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The emissions fluctuate over time and produce an extremely low frequency signal that travels great distances. allowing sensors to help identify the submarines.

From Washington Times • Aug. 16, 2023

Kadri’s calculations suggest that a cannon could shoot acoustic-gravity waves, which are extremely low frequency sound waves, at a tsunami to change its shape and disperse its energy over a larger area.

From Slate • Aug. 27, 2019

A nuke test—even one below ground—sets off a great wavefront of what’s known as infrasound, or extremely low frequency sounds inaudible to the human ear.

From Time • Jun. 26, 2013

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023