An Etymological Dictionary of Astronomy and Astrophysics
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A quantity, denoted L_d, describing a continuous system in the → Lagrangian formalism, and defined as the → Lagrangian per unit volume. It is related to the Lagrangian L by:
L = ∫∫∫L_d d³V.
Lagrangian density is often called Lagrangian when there is no ambiguity.

→ Lagrangian; → density.