GNU Collaborative International Dictionary of English

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1.       
   Ascension, n. [F. ascension, L. ascensio, fr. ascendere. See Ascend.]
   The act of ascending; a rising; ascent.
   1913 Webster
   Specifically: The visible ascent of our Savior on the fortieth day after his resurrection. (Acts i. 9.) Also, Ascension Day.
   1913 Webster
   An ascending or arising, as in distillation; also that which arises, as from distillation.
   1913 Webster
   Vaporous ascensions from the stomach.
   Sir T. Browne.
   
   1913 Webster
   Ascension Day, the Thursday but one before Whitsuntide, the day on which commemorated our Savior's ascension into heaven after his resurrection; -- called also Holy Thursday. -- Right ascension (Astron.), that degree of the equinoctial, counted from the beginning of Aries, which rises with a star, or other celestial body, in a right sphere; or the arc of the equator intercepted between the first point of Aries and that point of the equator that comes to the meridian with the star; -- expressed either in degrees or in time. -- Oblique ascension (Astron.), an arc of the equator, intercepted between the first point of Aries and that point of the equator which rises together with a star, in an oblique sphere; or the arc of the equator intercepted between the first point of Aries and that point of the equator that comes to the horizon with a star. It is little used in modern astronomy.
   1913 Webster