FM n. A method of transmitting radio signals by modulating the frequency of the carrier wave; opposed to AM (amplitude modulation), in which the signal modulates the amplitude, rather than the frequency of the carrier wave. (acron.)
... [FM472] The lynx was used like the lion in Ancient Egypt and the Chita-leopard in India: I have never seen or heard of ... — The Book of the Thousand Nights and a Night, Volume 2 • Richard F. Burton
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