Dictionary.com Unabridged

lm

Optics.
lumen; lumens.

L.M.

1.
Licentiate in Medicine.
2.
Licentiate in Midwifery.
3.
Lord Mayor.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
lm
 
symbol for
lumen

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

L.M. abbr.
Licentiate in Midwifery

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
lm
lumen
Lm
Lamentations
LM
  1. Legion of Merit

  2. lunar module

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

lm

unit of luminous flux, or amount of light, defined as the amount streaming outward through one steradian (a unit of solid angle, part of the volume of space illuminated by a light source) from a uniform point source having an intensity of one candela. The lumen is used in calculations regarding artificial lighting.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences for lm
See lm hash for a very widely deployed, and deplorably insecure, example.
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