simple past tense and past participle of keep

(geometry) Any of several nonconvex regular polyhedra with regular pentagrammatic faces or vertex figures and which can be obtained by stellation of the dodecahedron or icosahedron.

(astronomy) The three laws of planetary motion discovered by Kepler in the early 17th century, stating that (i) the orbit of a planet is an ellipse with the Sun at one of the two foci, (ii) a line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time, and (iii) the square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.

(astronomy, celestial mechanics) the mathematical relationship between the mean anomaly (M) and the eccentric anomaly (E) of a planet in an elliptical orbit with eccentricity (𝜀). M=E-𝜀· sin (E).

A cap with a flat circular top and a visor, particularly associated with French uniforms.

A woman who is supported financially by a lover (usually a married man).

plural of kepi

(mathematics) Any structure containing both Platonic and Archimedean solids, one inside the other. / (chemistry) Any complex of compounds having such a structure.

plural of Keplerate

Alternative spelling of cephalomancy