秋 (aki) means “fall” | MotiTan Japanese Dictionary

More examples

秋に葉が赤くなります。aki ni ha ga aka ku na ri ma su

In fall, leaves turn red.

秋になると、日が短くなります。aki ni na ru to hi ga mijika ku na ri ma su

When fall comes, the days become shorter.

Names the cooling season associated with harvests, shorter days, and the changing of leaves.

夏と冬の間にあり、気温が下がり木の葉が色づく季節。natsu to fuyu no aida ni a ri ki on ga sa ga ri ko no ha ga iro zu ku ki setsu

秋 (aki) is an old native Japanese seasonal word, preserved from Old Japanese into modern Japanese, although its deeper etymology is uncertain.

English uses fall in compounds such as fall colors and fall foliage for the colors and leaves associated with this season.