WordReference Random House Unabridged Dictionary of American English © 2026
LM (often lem),
  1. Aerospacelunar module.

lm, [Optics.]
  1. Opticslumen;
    lumens.

L.M., 
    1. Medicine, Licentiate in Medicine.
    2. Medicine, Licentiate in Midwifery.
    3. Lord Mayor.

Collins Concise English Dictionary © HarperCollins Publishers::
lm symbol for
  1. lumen
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'LM' also found in these entries (note: many are not synonyms or translations):
lumen - lm-hr - lumen-hour - lunar module

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