1. the measurement of the intensity of light or of relative illuminating power.
  2. the science dealing with such measurements.

Origin of photometry

From the New Latin word photometria, dating back to 1815–25. See photo-, -metry
Related formspho·to·met·ric [foh-tuh-me-trik] /ˌfoʊ təˈmɛ trɪk/, pho·to·met·ri·cal, adjectivepho·tom·e·trist, pho·to·me·tri·cian [foh-tuh-me-trish-uh n] /ˌfoʊ tə mɛˈtrɪʃ ən/, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for photometric

Historical Examples of photometric

British Dictionary definitions for photometric


  1. the measurement of the intensity of light
  2. the branch of physics concerned with such measurements
Derived Formsphotometric (ˌfəʊtəˈmɛtrɪk), adjectivephotometrically, adverbphotometrist, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

photometric in Science


  1. The measurement of the intensity, brightness, or other properties of light. Also called photometrics See also luminous intensity.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.