étendue

étendue (uncountable)

1. Alternative form of etendue.
   • 2003, Wolfgang Demtröder, “Spectroscopic Instrumentation”, in Laser Spectroscopy: Basic Concepts and Instrumentation (Advanced Texts in Physics), 3rd edition, Berlin: Springer-Verlag, DOI:10.1007/978-3-662-05155-9, →ISBN, ISSN 1439-2674, page 149:

     The light power transmitted to the detector is proportional to the product of the solid angle ${\displaystyle {\mathit {\Omega }}}$ and area ${\displaystyle A}$ in the central plane, which is imaged by the lens onto the aperture (often called the étendue ${\displaystyle U}$ ).

• IPA^(key): /e.tɑ̃.dy/

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étendue f

1. feminine plural of the past participle of étendre

étendue f (plural étendues)

1. expanse, area (of land, water etc.)
2. size (of a country, collection etc.)
3. scale, range, extent (of knowledge, damage etc.); depth (of ignorance)

• “étendue” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).