Dictionary.net

• Bending or bent downward, in a curve; declining.

1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.

• Directed downwards from its base: declination of the needle of a compass, the variation of the needle from the true meridian of a place: declination of a heavenly body, the angular distance of a celestical body from the equinoctial.

1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.