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From Middle English declinacioun, borrowed from Middle French declination, from Latin declinatio. Doublet of declension



declination (countable and uncountable, plural declinations)

  1. At a given point, the angle between magnetic north and true north.
  2. At a given point, the angle between the line connecting this point with the geographical center of the earth and the equatorial plane.
  3. A refusal.
    • Stow
      the queen's declination from marriage
  4. (grammar) Declension.
  5. (archaic) The act or state of bending downward; inclination.
    declination of the head
  6. (archaic) The act or state of falling off or declining from excellence or perfection; deterioration; decay; decline.
    • Francis Bacon
      the declination of monarchy
    • Waller
      Summer [] is not looked on as a time of declination or decay.
  7. (archaic) Deviation.
    • Bentley
      the declination of atoms in their descent
    • South
      every declination and violation of the rules

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