Festivus

noun

Fes·​ti·​vus ˈfe-sti-vəs 

: a popular celebration that is observed usually on December 23 especially as a secular alternative to Christmas

Note: The Festivus celebration first made its public appearance in a 1997 episode of the hit TV show "Seinfeld."

Word History

Etymology

borrowed from Latin fēstīvus "festal, fine, excellent, jovial, lively" — more at festive

First Known Use

1997, in the meaning defined above