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term of validity; period for which something is valid (e.g. ticket)
パスポートの有効期間は十年だ。
A passport's validity period is ten years.
保険証の有効期間を確認してから受診した。
I confirmed the insurance card's validity before visiting the doctor.
有効期間が切れる前に更新手続きを済ませた。
I completed the renewal procedure before the validity period expired.