定期券

1. Origins, structure, and basic meaning

• Structure: 定期券 (ていきけん) is a pass for repeated travel on a set route during a period. It appears as purchased and expiring.
• Basic usage: A school commuter pass is bought; its validity ends next month.

2. Common pitfalls and similar expressions

• Pass bought for commuting and validity reaching expiration
  • 通学用 states purpose; 期限が切れる ends usable duration. It differs from a single-ride ticket.