Economics. monetary aggregate: issued periodically by the Federal Reserve Board as various measures of money supply (M-1, M-1A, M-2, etc.). Compare L.

12.

British. motorway (used with a road number to designate a major highway): the M1.

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Etymonline

Word Origin & History

from Gk. mu, from Semitic mem. The Roman symbol for 1,000; sometimes used in this sense in English 15c.-16c.; but in modern newspaper headlines it stands for million.

Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage

Medical Dictionary

M ²
abbr.

molar
molarity
morgan
myopia

American Heritage

Science Dictionary

m
Abbreviation of mass, meter

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