from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The International System unit of illumination, equal to one lumen per square meter. See Table at measurement.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. In the International System of Units, the derived unit of illuminance or illumination; one lumen per square metre. Symbol: lx
  • v. To put out of joint; to luxate.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To put out of joint; to luxate.

from The Century Dictionary and Cyclopedia

  • To put out of joint; luxate. Pope, Odyssey, xi.
  • n. Luxury.
  • n. Richness; superfine quality; elegance: said of material objects. Also luxe, as mere French.
  • n. Light: a Latin word occurring in some phrases used more or less in English.
  • n. The unit of illumination; the illumination received by a surface at a distance of one meter from a light-source the intensity of which is one hefner. See illumination, 1.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle


Latin lūx, light; see leuk- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin lūx ("light"); from Proto-Indo-European *lewk- (“white; light; bright”). Cognates include Ancient Greek λευκός (leukos), Sanskrit रोचते (rocate) and Old English noun lēoht (English light). (Wiktionary)
Compare French luxer. See luxate. (Wiktionary)


Wordnik is becoming a not-for-profit! Read our announcement here.


Log in or sign up to get involved in the conversation. It's quick and easy.

  • The dear Lux Lisbon.

    October 18, 2008

  • A unit for measuring the illumination (illuminance) of a surface. One lux is defined as an illumination of one lumen per square meter or 0.0001 phot.

    November 6, 2007

  • Oh, this is the love-hate word on my list. I am on Lux, unapologetically feminine.

    March 4, 2007