• 座席ざせき — seat
• 講座こうざ — course / lecture series
• 座談会ざだんかい — round-table talk
• 正座せいざ — sitting upright on floor
• 星座せいざ — constellation

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座 often conveys the idea of being seated formally, being in a position, or participating in a gathering. In classical usage, it also referred to guilds or performing troupes.

It appears in both physical and metaphorical contexts—such as 座席ざせき (a real seat) or 講座こうざ (a seat of learning).

この映画館えいがかんでは 自由じゆう席せきと 指定席していせきの座席ざせきがある。
This movie theater has both free seating and reserved seats.

みんなで座談会ざだんかいを 開ひらいた。
We held a round-table discussion.