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 tithonicity is as below...

Tithonometer :: Tithonometer (n.) An instrument or apparatus for measuring or detecting tithonicity; an actinometer.

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

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