This is the 4705th most frequent Japanese word.
昨秋
"昨秋" means "last autumn (fall)."
The word '昨秋' refers to a specific past season, 'last autumn', indicating the time of the described event.
昨秋、私は新しい趣味を始めました。
Last autumn, I started a new hobby.
In this sentence, '昨秋' is used to describe a past autumn season, specifying a time context for the described scenery.
昨秋の紅葉はとても美しかったです。
The autumn leaves last fall were very beautiful.
Here, '昨秋' specifies the season in which the event of starting a new job occurred, emphasizing the timing.