Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. The period of time between two successive transits of the mean sun; the standard for the 24-hour day measured from midnight to midnight.
Wiktionary
- n. the average length of a solar day, used for practical timekeeping
GNU Webster's 1913
- n. the mean or average of all the apparent solar days of the year.
WordNet 3.0
- n. time for Earth to make a complete rotation on its axis
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