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2 definitions found
 for Periodical year
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 The Collaborative International Dictionary of English v.0.48 :

  Anomalistic \A*nom`a*lis"tic\, Anomalistical
  \A*nom`a*lis"tic*al\, a. [Cf. F. anomalistique.]
     1. Irregular; departing from common or established rules.
        [1913 Webster]
     2. (Astron.) Pertaining to the anomaly, or angular distance
        of a planet from its perihelion.
        [1913 Webster]
     Anomalistic month. See under Month.
     Anomalistic revolution, the period in which a planet or
        satellite goes through the complete cycles of its changes
        of anomaly, or from any point in its elliptic orbit to the
        same again.
     Anomalistic, or Periodical year. See under Year.
        [1913 Webster]

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