1A defined span of time during which something takes place or continues; a period with a set start and end.
保証期間は購入日から一年間です。
The warranty period is one year from the date of purchase.
このキャンペーンは今月末までの期間限定です。
This campaign is available for a limited time until the end of this month.
入院期間はおよそ二週間の予定だそうです。
I heard the hospital stay is expected to last about two weeks.
試用期間中は給料が少し低く設定されている。
During the probationary period, the salary is set a little lower.