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Pronunciation:  `eekwu'nâkshul

WordNet Dictionary
  1. [n]  the great circle on the celestial sphere midway between the celestial poles
  2. [adj]  relating to an equinox (when the lengths or night and day are equal)
  3. [adj]  relating to the vicinity of the equator

EQUINOCTIAL is a 11 letter word that starts with E.


 Synonyms: celestial equator, equinoctial circle, equinoctial line
 See Also: great circle, right ascension



Webster's 1913 Dictionary
  1. \E`qui*noc"tial\, a. [L. aequinoctials, fr.
    aequinoctium equinox: cf. F. ['e]quinoxial. See {Equinox}.]
    1. Pertaining to an equinox, or the equinoxes, or to the time
       of equal day and night; as, the equinoctial line.
    2. Pertaining to the regions or climate of the equinoctial
       line or equator; in or near that line; as, equinoctial
       heat; an equinoctial sun.
    3. Pertaining to the time when the sun enters the equinoctial
       points; as, an equinoctial gale or storm, that is, one
       happening at or near the time of the equinox, in any part
       of the world.
    {Equinoctial colure} (Astron.), the meridian passing through
       the equinoctial points.
    {Equinoctial line} (Astron.), the celestial equator; -- so
       called because when the sun is on it, the nights and days
       are of equal length in all parts of the world. See
             Thrice the equinoctial line He circled. --Milton.
    {Equinoctial points} (Astron.), the two points where the
       celestial and ecliptic intersect each other; the one being
       in the first point of Aries, the other in the first point
       of Libra.
    {Equinoctial time} (Astron.) reckoned in any year from the
       instant when the mean sun is at the mean vernal
       equinoctial point.
  2. \E`qui*noc"tial\, n.
    The equinoctial line.