a bending, sloping, or moving downward.
deterioration; decline.
a swerving or deviating, as from a standard.
a polite refusal.
Astronomy. the angular distance of a heavenly body from the celestial equator, measured on the great circle passing through the celestial pole and the body.
variation ( def 8 ).
the formal refusal by a nominee of a nomination to public office.

1350–1400; Middle English declinacioun < Old French declinacion < Latin dēclīnātiōn- (stem of dēclīnātiō), equivalent to dēclīnāt(us), literally, turned aside (past participle of dēclīnāre; see decline, -ate1) + -iōn- -ion

declinational, adjective
predeclination, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
declination (ˌdɛklɪˈneɪʃən)
1.  astronomy δ, Compare: right ascension the angular distance, esp in degrees, of a star, planet, etc, from the celestial equator measured north (positive) or south (negative) along the great circle passing through the celestial poles and the body
2.  See magnetic declination
3.  a refusal, esp a courteous or formal one

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c. as a term in astronomy, from O.Fr. déclinacion, from L. declinationem, noun of action from declinare (see decline). It took on various other senses 15c.-17c., most now obsolete.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

declination dec·li·na·tion (děk'lə-nā'shən)

  1. A bending, sloping, or other deviation from a normal vertical position.

  2. A deviation of the vertical meridian of the eye to one or the other side due to rotation of the eyeball about its anteroposterior axis.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
declination   (děk'lə-nā'shən)  Pronunciation Key 
  1. On the celestial sphere, the position of a celestial object north or south of the celestial equator. Declination is measured in degrees along a great circle drawn through the object being measured and the north and south celestial poles, with positive values north of the celestial equator and negative values south of it, so that the equator itself is 0° and the north and south celestial poles are +90° and -90° declination respectively. See more at equatorial coordinate system.

  2. See magnetic declination.

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