tropical year

plural tropical years

1. The time that it takes for the Sun to return to the same position along the ecliptic, as viewed from the Earth, especially, completing a full cycle of seasons.
2. A vernal equinox year; the time between two successive vernal equinoxes.

   Synonyms: solar year, astronomical year, equinoctial year, Sothic year

3. broadlyThe time it takes for any astronomical object (such as a planet, dwarf planet, small Solar System body, or comet) in direct orbit around a star (such as the Sun) to make one revolution around the star, taking into account orbital precession.