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radiometry
measurement of the quantities associated with optical radiation
Note 1 to entry: The term "photometry" is sometimes used in a broader sense covering radiometry, but this use is deprecated.
Note 2 to entry: This entry was numbered 845-05-05 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-1032 in CIE S 017:2011.