Felicity n. : The state of being happy; blessedness; blissfulness; enjoyment of good.

Felicity n. : That which promotes happiness; a successful or gratifying event; prosperity; blessing.

Felicity n. : A pleasing faculty or accomplishment; as, felicity in painting portraits, or in writing or talking.

Example:
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Taxonomy
Felicity Porter, episode guide, music, spoilers, characters, Noel, Julie, Elena, Keri Russell, character info.

Defination from the web:
Felicity character info, episode guide, picture gallery, links, music, spoilers, postcards and Felicity news.