[{"Bold_text": "noun", "List Items": ["the degree of inclination, or the rate of ascent or descent, in a highway, railroad, etc.", "an inclined surface; grade; ramp.", "Physics.the rate of change with respect to distance of a variable quantity, as temperature or pressure, in the direction of maximum change.a curve representing such a rate of change.", "the rate of change with respect to distance of a variable quantity, as temperature or pressure, in the direction of maximum change.", "a curve representing such a rate of change.", "Mathematics.a differential operator that, operating upon a function of several variables, results in a vector the coordinates of which are the partial derivatives of the function.:grad.:?"]}, {"Bold_text": "adjective", "List Items": ["rising or descending by regular degrees of inclination.", "progressing by walking; stepping with the feet as animals do.", "of a type suitable for walking or running, as the feet of certain birds; gressorial."]}]