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What do a.m. and p.m. stand for?

high frequency

noun
1.
the range of frequencies in the radio spectrum between 3 and 30 megahertz.
Origin of high frequency
1890-1895
1890-95
Related forms
high-frequency, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for high frequency

high frequency

noun
1.
a radio-frequency band or radio frequency lying between 3 and 30 megahertz HF
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 Value for high

11
10
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