the arithmetic mean of the greatest and least distances of a planet from the sun, used in stating the size of an orbit; the semimajor axis.
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- mean business,
- mean calorie,
- mean cell hemoglobin,
- mean cell hemoglobin concentration,
- mean deviation,
- mean free path,
- mean length of utterance,
- mean lethal dose,
- mean life,
- mean line
Origin of mean distance
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the average of the greatest and least distances of a celestial body from its primary
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