Geometry, something slanting, or that deviates from the perpendicular. Thus an oblique angle is either an acute or obtuse one, i.e., any angle except a right one.

Oblique Cases, in Grammar, are all the cases except the nominative. See Grammar.

Oblique Ascension, is that point of the equinoctial which rises with the centre of the sun, or star, or any other point of the heavens, in an oblique sphere.

Oblique Circle, in the stereographic projection, is any circle that is oblique to the plane of projection.

Oblique Declination, that point of the equinoctial which falls with the centre of the sun, or star, or any other point of the heavens, in an oblique sphere.

Oblique Line, that which, falling on another line, makes oblique angles with it, viz. one acute, and the other obtuse.

Oblique Planes, in Dialling, are those which decline from the zenith, or incline towards the horizon. See Dial.

Oblique Sailing, in Navigation, is when a ship sails upon some rhumb between the four cardinal points, making an oblique angle with the meridian; in which case she continually changes both latitude and longitude. See Navigation, Chap. VIII.