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declination (n.)

late 14c., declinacioun, in astronomy, "distance of a heavenly body from the celestial equator, measured on a great circle passing through the body and the celestial pole," from Old French declinacion (Modern French déclinaison) and directly from Latin declinationem (nominative declinatio) "a bending from (something), a bending aside; the supposed slope of the earth toward the poles; a turning away from (something), an avoiding," noun of action from past-participle stem of declinare (see decline (v.)). From c. 1400 as "a bending or sloping downward." Related: Declinational.

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Definitions of declination

declination (n.)
a condition inferior to an earlier condition; a gradual falling off from a better state;
Synonyms: decline
declination (n.)
a downward slope or bend;
Synonyms: descent / declivity / fall / decline / declension / downslope
declination (n.)
(astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere;
Synonyms: celestial latitude / dec
declination (n.)
a polite refusal of an invitation;
Synonyms: regrets
From wordnet.princeton.edu