PRECESSION

precession, precedence, precedency

(noun) the act of preceding in time or order or rank (as in a ceremony)

precession

(noun) the motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out a cone

Source: WordNet® 3.1

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Etymology

Noun

precession (countable and uncountable, plural precessions)

(uncountable) Precedence.

(physics, countable) The wobbling motion of the axis of a spinning body when there is an external force acting on the axis.

(astronomy, uncountable) The slow gyration of the earth's axis around the pole of the ecliptic, caused mainly by the gravitational torque of the sun and moon.

Any of several slow changes in an astronomical body's rotational or orbital parameters.

Anagrams

• encopresis, necropsies, preconises

Source: Wiktionary

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Pre*ces"sion, n. Etym: [L. praecedere, praecessum, to go before: cf. F. précession. See Precede.]

Definition: The act of going before, or forward. Lunisolar precession. (Astron.) See under Lunisolar.

– Planetary precession, that part of the precession of the equinoxes which depends on the action of the planets alone.

– Precession of the equinoxes (Astron.), the slow backward motion of the equinoctial points along the ecliptic, at the rate of 50.2" annually, caused by the action of the sun, moon, and planets, upon the protuberant matter about the earth's equator, in connection with its diurnal rotation; -- so called because either equinox, owing to its westerly motion, comes to the meridian sooner each day than the point it would have occupied without the motion of precession, and thus precedes that point continually with reference to the time of transit and motion.

Source: Webster’s Unabridged Dictionary 1913 Edition

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