costate /ˈkɒsteɪt/adjective 2/ˈkəʊsteɪt/ noun 2forms 1 adjective2 •Having ribs, or the appearance of ribs. •Having one or more longitudinal ribs. costate /ˈkəʊsteɪt/ noun2 •An equation or variable related to the state equation of an optimal control problem in a dynamical system. •A state in alliance with another state. formscostates
