Regular.Well-regulated; orderly; proper; due.In entomology, placed in one or more regular rows: as, ordinate spines, punctures, spots, etc.n. In analytical geometry, a line used to determine the position of a point in space, drawn from the point to the axis of abscissas and parallel to the axis of ordinates. See abscissa, and Cartesian coördinates (under Cartesian).To ordain; appoint.To direct; dispose.n. Any one of a set of parallel chords of a conic in relation to the diameter bisecting them. What in this sense was called semiordinate is now usually called ordinate.