- declination [dek΄lə nā′shən]n.[ME declinacioun < L declinatio: see DECLENSION]1. a bending or sloping downward; deviation from the horizontal or vertical2. an oblique variation from some definite direction3. the angle formed by a magnetic needle with the line pointing to the geographical North Pole4. a polite declining or refusal5. Archaic decline; deterioration; decay6. Astron. the angular distance of a celestial body north or south from the celestial equator: it is used with RIGHT ASCENSION to find an exact position in the sky: abbrev. Dec, dec
English World dictionary. V. Neufeldt. 2014.