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Spanish word felicidad comes from Latin felix, Latin -itatem
felix (Latin)
(religion, archaic) of the noble fruits offered to the deities. Auspicious, favorable, of good omen or luck. Fertile, fruitful, prosperous. Happy, lucky, blessed, fortunate.
-itatem (Latin)
felicitas (Latin)
Fruitfulness, fertility. Happiness, felicity. Success, good fortune.
felicidad (Spanish)
Felicity, happiness.