[La.grang.ian] n [Joseph-Louis Lagrange] (1938): a function that describes the state of a dynamic system in terms of position coordinates and their time derivatives and that is equal to the difference between the potential energy and kinetic energy--compare hamiltonian
LAGRANGIAN
Meaning of LAGRANGIAN in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012