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Am

 
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The symbol for the element americium.


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Britannica Concise Encyclopedia: AM
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Variation of the amplitude of a carrier wave (commonly a radio wave) in correspondence to fluctuations in the audio or video signal being transmitted. AM is the oldest method of broadcasting radio programs. Commercial AM stations operate in the frequency range of 535 to 1605 kHz. Because radio waves of these frequencies are reflected back to the Earth's surface by the ionosphere, they can be detected by receivers hundreds of miles away. In addition to commercial radio broadcasting, AM is also employed in short-wave radio broadcasts, and in transmitting the video portion of television programs. See also FM.

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US Military Dictionary: AM
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abbr. amplitude modulation.

See the Introduction, Abbreviations and Pronunciation for further details.

Measures and Units: AM
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Home > Library > Science > Measures and Units

a.m.

[Etymology: ante meridian, i.e. before the meridian] time Indicative of a time before noon, i.e. before the Sun nominally reaches the meridian, so the time is before the meridian. See p.m. for discussion.

 
Columbia Encyclopedia: Am
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Home > Library > Miscellaneous > Columbia Encyclopedia
Am, symbol for the element americium.

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Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
US Military Dictionary. The Oxford Essential Dictionary of the U.S. Military. Copyright © 2001, 2002 by Oxford University Press, Inc. All rights reserved.  Read more
Measures and Units. A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved.  Read more
Celtic Mythology. A Dictionary of Celtic Mythology. Copyright © James MacKillop 1998, 2004. All rights reserved.  Read more
Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/.  Read more