CM.

centimeter

[sen-tuh-mee-ter]
noun
one 100th of a meter, equivalent to 0.3937 inch. Abbreviation: cm, cm.
Also, especially British, centimetre.


Origin:
1795–1805; < French centimètre. See centi-, meter1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

centimeter
1801, from Fr., coined from L. centum "hundred" (see hundred) + Fr. metre.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

centimeter cen·ti·me·ter (sěn'tə-mē'tər)
n.
Abbr. cm
A unit of length equal to one hundredth (10-2) of a meter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
centimeter   (sěn'tə-mē'tər)  Pronunciation Key 
A unit of length in the metric system equal to 0.01 meter. See Table at measurement.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
centimeter [(sen-tuh-mee-tuhr)]

A unit of length in the metric system; one-hundredth of a meter, or about two-fifths of an inch.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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