The time for the earth to make one complete revolution around the sun, relative to the fixed stars WordNet 3.0 & Open English WordNet

A sidereal year, also called a sidereal orbital period, is the time that Earth or another planetary body takes to orbit the Sun once with respect to the fixed stars. Wikipedia

Time taken by the Earth to orbit the Sun once with respect to the fixed stars Wikidata

The orbital period of the Earth; a measure of the time it takes for the Sun to return to the same position with respect to the stars of the celestial sphere. A sidereal year is about 20.4 minutes longer than the tropical year (which is what is kept stable by the Gregorian calendar) due to precession of the equinoxes. Wiktionary

Orbital period. Wiktionary (translation)