An inflatable buoyant object, often (but not necessarily) round and flexible. / Such an object as a child’s toy or party decoration. / Such an object designed to transport people through the air.

(intransitive) To increase or expand rapidly. / (intransitive) To go up or voyage in a balloon. / (transitive) To take up in, or as if in, a balloon. / (transitive) To inflate like a balloon.

Enough to fill a balloon.

plural of balloonful

(archaic) The sport or hobby of flying in a hot-air balloon.

present participle of balloon

The act of something that swells or expands. / (uncountable) The sport or hobby of flying in a hot-air balloon.

Growing rapidly as a balloon. / Rising high in the air.

Third-person singular simple present indicative form of balloon; Enlarges, gets bigger

plural of balloon