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1 definition found
 for Annual variation
From The Collaborative International Dictionary of English v.0.48 :

  Variation \Va`ri*a"tion\, n. [OE. variatioun, F. variation, L.
     variatio. See Vary.]
     1. The act of varying; a partial change in the form,
        position, state, or qualities of a thing; modification;
        alteration; mutation; diversity; deviation; as, a
        variation of color in different lights; a variation in
        size; variation of language.
        [1913 Webster]
  
              The essences of things are conceived not capable of
              any such variation.                   --Locke.
        [1913 Webster]
  
     2. Extent to which a thing varies; amount of departure from a
        position or state; amount or rate of change.
        [1913 Webster]
  
     3. (Gram.) Change of termination of words, as in declension,
        conjugation, derivation, etc.
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     4. (Mus.) Repetition of a theme or melody with fanciful
        embellishments or modifications, in time, tune, or
        harmony, or sometimes change of key; the presentation of a
        musical thought in new and varied aspects, yet so that the
        essential features of the original shall still preserve
        their identity.
        [1913 Webster]
  
     5. (Alg.) One of the different arrangements which can be made
        of any number of quantities taking a certain number of
        them together.
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     Annual variation (Astron.), the yearly change in the right
        ascension or declination of a star, produced by the
        combined effects of the precession of the equinoxes and
        the proper motion of the star.
  
     Calculus of variations. See under Calculus.
  
     Variation compass. See under Compass.
  
     Variation of the moon (Astron.), an inequality of the
        moon's motion, depending on the angular distance of the
        moon from the sun. It is greater at the octants, and zero
        at the quadratures.
  
     Variation of the needle (Geog. & Naut.), the angle included
        between the true and magnetic meridians of a place; the
        deviation of the direction of a magnetic needle from the
        true north and south line; -- called also declination of
        the needle.
        [1913 Webster]
  
     Syn: Change; vicissitude; variety; deviation.
          [1913 Webster]

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