What do a.m. and p.m. stand for?

compound number

a quantity expressed in more than one denomination or unit, as one foot six inches or one minute twenty seconds.
Origin of compound number
1550-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for compound number
  • Fractions are also hyphenated unless the numerator or denominator is a compound number that also requires a hyphen.
  • The user will input the circulating compound number for each metabolite.
British Dictionary definitions for compound number

compound number

a quantity expressed in two or more different but related units: 3 hours 10 seconds is a compound number
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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