2 definitions found From WordNet (r) 2.0 [wn]: actinometry noun: measuring the intensity of electromagnetic radiation (especially of the sun's rays) From The Collaborative International Dictionary of English v.0.44 [gcide]: Actinometry \Ac'ti*nom"e*try\, noun 1. The measurement of the force of solar radiation. --Maury. 2. The measurement of the chemical or actinic energy of light. --Abney.

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