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season (period in which regulated games are played)
season (division of the year)
season (of a TV show, etc.)
season (for doing something, e.g. ski season, entrance examination season)
今はシーズン中だ。
It's currently in season.
シーズンチケットを買った。
I bought a season ticket.
シーズンが終わるのが寂しい。
I'm sad that the season is ending.