Webster's English Dictionary

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felicity

fe.lic.i.ty \fi-'lis-*t-e-\ n [ME felicite, fr. MF felicite`, fr. L 
   felicitat-, felicit]as, fr. felic-, felix fruitful, happy 1a: the quality 
   or state of being happy; esp : great happiness  1b: an instance of 
   happiness  2: something that causes happiness  3: a pleasing faculty esp. 
   in art or language : APTNESS  4: an apt expression