A long, soft feather or arrangement of feathers used by a bird for display or worn by a person for ornament. The peacock's tail is adorned with a magnificent plume of colorful feathers.
A mass of material, such as smoke, dust, or vapor, that resembles a feather in shape and spreads from a source. A plume of smoke rose from the chimney, signaling that the fire was burning well.
A token of honor or achievement, often used metaphorically. Winning the championship was a plume in the team's cap.
Geology: A localized column of hot, buoyant magma rising through the Earth's mantle. Scientists believe a mantle plume is responsible for the volcanic activity in the region.