Something that's aflame is on fire. You might accidentally set your marshmallow aflame when you're toasting it over a campfire.

Cherries jubilee is a dessert that's famous for being set aflame at the table, and a stray bolt of lightning can set the roof of a house aflame. In either case, something's burning. You can also use the word figuratively, to describe someone who's very excited: "He was aflame with enthusiasm when he learned there would be a new Harry Potter book." The Latin root of aflame is flamma, "blazing fire."

Definitions of aflame

adj lighted up by or as by fire or flame

“even the car's tires were aflame
ablaze, afire, aflare, alight, on fire
lighted, lit
set afire or burning

adj keenly excited (especially sexually) or indicating excitement

“he was aflame with desire”
ablaze, aroused
having or expressing strong emotions

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