L1

English

From language 1, meaning "first language."

L1 (plural L1s)

Lagrange points (green), primary central object (yellow) and secondary orbiting object (blueP

(astrophysics) first Lagrange point, located further in towards the primary of a system where a smaller object orbits a larger one, in front of the smaller object, inline with a line drawn through the centres of the larger and smaller objects