The four seasons—spring, summer, autumn, and winter; the seasonal cycle and related changes/events.
日本は四季がはっきりしている場所だ。
Japan is a place with distinct four seasons.
四季折々の花を楽しむのが好きだ。
I like enjoying the flowers of each season.
四季それぞれに合わせた料理がある。
There are dishes suited to each of the four seasons.