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photometry

The English word “photometry” has 2 meanings listed here.

noun

  1. The measurement of various aspects of light, especially its intensity.
  2. The measurement of the intensity and spectrum of light from stars.

Etymology

From photo- + -metry.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.