Webster's Revised Unabridged Dictionary (1913)
The act of going before, or forward.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version
you can click anywhere, but just don't click here.
\pre*ces"sion\ (?), n. [l. praecedere, praecessum, to go before: cf. f. précession. see precede.] the act of going before, or forward.
precession of the equinoxes
for Vocabulary Exams of KPDS, YDS,UDS (in Turkey); and SAT in America
The act of going forward.
Glossary of Astrological Terms
Due to the pole of the equator revolving around the pole of the ecliptic, the equinoctial point moves backward with relation to the constellations at the rate of approximately 50" per year. It makes a complete revolution through the twelve constellations in the great cosmic year of 25,920 earthly years, or 2160 years to pass through one constellation. There is disagreement among authorities as to the exact position of the vernal equinox (0° Aries) at present, but all are agreed that it is approaching the end of the Age of Pisces and entering the Age of Aquarius.