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mega-Symbol: M. A prefix to a unit, indicating a multiple of 106 (i.e. one million) of that unit. For example, one megaparsec (symbol: Mpc) is one million parsecs.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
(science and technology)
A prefix representing 106, or one million. Abbreviated M.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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