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Etymology 1[edit]

From Language 1 (first language).


L1 (plural L1s)

  1. Mother tongue; someone's native language.
    Coordinate term: L2
    • 2017, Di Zou; James Lambert, “Feedback methods for student voice in the digital age”, in British Journal of Educational Technology, volume 48, number 5, page 1085:
      This advantage was pertinent in the Hong Kong context where English is largely an L2 language, although would not be expected to be as large in an L1 context.

Etymology 2[edit]

Lagrange points (green), primary central object (yellow) and secondary orbiting object (blue point).


L1 (plural L1s)

  1. (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
Related terms[edit]

Etymology 3[edit]

From Level 1


L1 (uncountable)

  1. (computing) Short for first level in various contexts
    1. (computing) The first-level cache of a processor, closer to the processor than the second level cache.
      • 2009, Sandeep Koranne, Practical Computing on the Cell Broadband Engine[1], →ISBN, page 22:
        Writing of the L1 is performed one cache line at a time and can be 64 bytes or 32 bytes.
    2. (networking) The physical layer in the seven layer OSI network model.
Usage notes[edit]

The first level cache is more often written as L1 cache than as L1 except when used attributively in writing meant for a technical audience.