American Heritage® Dictionary of the English Language, Fourth Edition
- n. See solar year.
- n. The time that it takes for the Sun to return to the same position along the ecliptic, as viewed from the Earth, especially:
- n. A vernal equinox year, the time between two successive vernal equinoxes.
GNU Webster's 1913
- n. See under Tropical.
- n. the time for the earth to make one revolution around the sun, measured between two vernal equinoxes
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