Definition: Preferred before all others of the same kind; a person or thing regarded with special favor or preference.
Regional variation in some regions in the U.S.
Regional and generational variations in some regions of Canada.
Very common usage. Though it's an adjective in English, it's commonly used as a verb in ASL sentences. Both of them fit the concept, but they don't equate with the speech of parts in a sentence.
E.g. The phrase "Her favorite person..." shows in English whereas it works in ASL as THAT(IX2) PERSON/\ IX1-she KISS-FIST (verb)...