felicity (n.) Look up felicity at Dictionary.com
late 14c., from Old French felicite (14c.) "happiness," from Latin felicitatem (nominative felicitas) "happiness, fertility," from felix (genitive felicis) "happy, fortunate, fruitful, fertile," from Latin root *fe-, equivalent of PIE *dhe(i)- "to suck, suckle, produce, yield" (see fecund).