noun, adverb
The season between summer and winter. Can be used as a noun or adverbially (e.g., 秋に, 秋は).
秋になると、木の葉が赤や黄色に変わる。
In autumn, the leaves turn red and yellow.
今年の秋は、旅行に行く予定です。
I plan to travel this fall.
The historical derivation is uncertain; the kanji 秋 has been used to represent the season since ancient times.