What does 気球 mean?
気球 is a Japanese noun meaning “balloon (hot-air, weather, etc.); blimp” in English. It is written as 気球 in kanji, ききゅう in hiragana, and kikyuu in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
気球が空に浮かんでいた。
A balloon was floating in the air.