Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of actinism is as below...

Actinism :: Actinism (n.) The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography..

Tithonicity :: Tithonicity (n.) The state or property of being tithonic; actinism.

Actino-chemistry :: Actino-chemistry (n.) Chemistry in its relations to actinism.

Actinic :: Actinic (a.) Of or pertaining to actinism; as, actinic rays..

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