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3 definitions found
 for Platonic year
From The Collaborative International Dictionary of English v.0.48 :

  Platonic \Pla*ton"ic\, Platonical \Pla*ton"ic*al\, a. [L.
     Platonicus, Gr. ?: cf. F. platonique.]
     1. Of or pertaining to Plato, or his philosophy, school, or
        [1913 Webster]
     2. Pure, passionless; nonsexual; philosophical.
        [1913 Webster]
     Platonic bodies, the five regular geometrical solids;
        namely, the tetrahedron, hexahedron or cube, octahedron,
        dodecahedron, and icosahedron.
     Platonic love, a pure, spiritual affection, subsisting
        between persons of opposite sex, unmixed with carnal
        desires, and regarding the mind only and its excellences;
        -- a species of love for which Plato was a warm advocate.
     Platonic year (Astron.), a period of time determined by the
        revolution of the equinoxes, or the space of time in which
        the stars and constellations return to their former places
        in respect to the equinoxes; -- called also great year.
        This revolution, which is caused by the precession of the
        equinoxes, is accomplished in about 26,000 years.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Year \Year\, n. [OE. yer, yeer, [yogh]er, AS. ge['a]r; akin to
     OFries. i?r, g?r, D. jaar, OHG. j[=a]r, G. jahr, Icel. [=a]r,
     Dan. aar, Sw. [*a]r, Goth. j?r, Gr. ? a season of the year,
     springtime, a part of the day, an hour, ? a year, Zend
     y[=a]re year. [root]4, 279. Cf. Hour, Yore.]
     [1913 Webster]
     1. The time of the apparent revolution of the sun trough the
        ecliptic; the period occupied by the earth in making its
        revolution around the sun, called the astronomical year;
        also, a period more or less nearly agreeing with this,
        adopted by various nations as a measure of time, and
        called the civil year; as, the common lunar year of 354
        days, still in use among the Mohammedans; the year of 360
        days, etc. In common usage, the year consists of 365 days,
        and every fourth year (called bissextile, or leap year) of
        366 days, a day being added to February on that year, on
        account of the excess above 365 days (see Bissextile).
        [1913 Webster]
              Of twenty year of age he was, I guess. --Chaucer.
        [1913 Webster]
     Note: The civil, or legal, year, in England, formerly
           commenced on the 25th of March. This practice continued
           throughout the British dominions till the year 1752.
           [1913 Webster]
     2. The time in which any planet completes a revolution about
        the sun; as, the year of Jupiter or of Saturn.
        [1913 Webster]
     3. pl. Age, or old age; as, a man in years. --Shak.
        [1913 Webster]
     Anomalistic year, the time of the earth's revolution from
        perihelion to perihelion again, which is 365 days, 6
        hours, 13 minutes, and 48 seconds.
     A year's mind (Eccl.), a commemoration of a deceased
        person, as by a Mass, a year after his death. Cf. A
        month's mind, under Month.
     Bissextile year. See Bissextile.
     Canicular year. See under Canicular.
     Civil year, the year adopted by any nation for the
        computation of time.
     Common lunar year, the period of 12 lunar months, or 354
     Common year, each year of 365 days, as distinguished from
        leap year.
     Embolismic year, or Intercalary lunar year, the period of
        13 lunar months, or 384 days.
     Fiscal year (Com.), the year by which accounts are
        reckoned, or the year between one annual time of
        settlement, or balancing of accounts, and another.
     Great year. See Platonic year, under Platonic.
     Gregorian year, Julian year. See under Gregorian, and
     Leap year. See Leap year, in the Vocabulary.
     Lunar astronomical year, the period of 12 lunar synodical
        months, or 354 days, 8 hours, 48 minutes, 36 seconds.
     Lunisolar year. See under Lunisolar.
     Periodical year. See Anomalistic year, above.
     Platonic year, Sabbatical year. See under Platonic, and
     Sidereal year, the time in which the sun, departing from
        any fixed star, returns to the same. This is 365 days, 6
        hours, 9 minutes, and 9.3 seconds.
     Tropical year. See under Tropical.
     Year and a day (O. Eng. Law), a time to be allowed for an
        act or an event, in order that an entire year might be
        secured beyond all question. --Abbott.
     Year of grace, any year of the Christian era; Anno Domini;
        A. D. or a. d.
        [1913 Webster] year 2000 bug

From WordNet (r) 3.0 (2006) :

  Platonic year
      n 1: time required for one complete cycle of the precession of
           the equinoxes, about 25,800 years [syn: great year,
           Platonic year]

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