slope of a plane

Webster's Dictionary (GCIDE)

1.An oblique direction; a line or direction including from a horizontal line or direction; also, sometimes, an inclination, as of one line or surface to another. [1913 Webster]

2.Any ground whose surface forms an angle with the plane of the horizon. [1913 Webster]

buildings the summit and slope of a hill.— Macaulay.[1913 Webster]

Under the slopes of Pisgah.— Deut. iv. 49. (Rev. Ver.).[1913 Webster]

3.The part of a continent descending toward, and draining to, a particular ocean; as, the Pacific slope. [Webster 1913 Suppl.]

Note: A slope, considered as descending, is a declivity; considered as ascending, an acclivity. [1913 Webster]

Slope of a plane (Geom.), the direction of the plane; as, parallel planes have the same slope. [1913 Webster]