The difference between the kinetic energy and the potential energy of a system expressed as a function of generalized coordinates, their time derivatives, and time
Each of five points in the orbital plane of two bodies (e.g. a planet and a moon) at which a third body of negligible mass will remain stationary relative to the others
Lagrangian relaxation is a relaxation technique which works by moving hard constraints into the objective so as to exact a penalty on the objective if they are not satisfied