L1

noun5

1. •
   A mother tongue; someone's native language; own language.

   • 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. — 2017
2. •
   The first-level cache of a processor, closer to the processor than the second-level cache.

   • Writing of the L1 is performed one cache line at a time and can be 64 bytes or 32 bytes. — 2009
3. •
   The physical layer in the seven-layer OSI network model.
4. •
   Short for first level in various contexts.
5. •
   Abbreviation of Lagrange point 1, located between the larger and smaller objects along a line connecting the two.