If you're throwing a party and you want it to be fun and fabulous, you're hoping for a festal event. Anything that's festal has a jubilant, celebratory quality.

The adjective festal is a little old-fashioned; these days, you're more likely to use festive instead. The two words are closely related to festival, which was originally defined as "a festal day." All three words share a Latin root, festum, or "feast" — and everyone knows that a feast is at the heart of every truly festal celebration.

Definitions of festal

adj offering fun and gaiety

“a festive (or festal) occasion”
festive, gay, merry
full of or characterized by joy

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