Felicity is defined as a state of feeling great happiness, or the ability to appropriately express your emotions or thoughts.
(noun)See felicity in Webster's New World College Dictionary
noun pl. felicities
Origin: ME felicite < OFr felicité < L felicitas, happiness < felix (gen. felicis), happy, orig., fertile, fruitful, nourishing: for IE base see female
See felicity in American Heritage Dictionary 4
noun pl. fe·lic·i·ties
Origin:
Origin: Middle English felicite
Origin: , from Old French felicite
Origin: , from Latin fēlīcitās
Origin: , from fēlīx, fēlīc-, fortunate; see dhē(i)- in Indo-European roots
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