worship, practising faith

(obsolete) Having faith or a faith; honest; sincere. / Having faith of a specified quality or type.

(archaic) really, truly

plural of faithe

(category theory) A functor which maps morphisms from its source to its target category in such a way that the restriction of that mapping to any source hom-set is injective into the corresponding target hom-set.

(biology, of birds) That return to the same breeding grounds every year (typically generation after generation)

(Islam) Arabic title of caliphs and other independent sovereign Muslim rulers who claim legitimacy from a community of Muslims.

A geyser in the American national park of Yellowstone, known for its regular eruptions.

plural of faithful functor

(figuratively) The act of believing in something despite lack of proof of its truth or existence, or the attempt of something without being sure of its possible outcome.