1.
period, term, duration
A length of time with defined start and end points.
期間 refers to a span of time with a defined beginning and end.
COMMON COMPOUNDS:
- 期間中: during the period
- 期間限定: limited time (offer)
- 有効期間: validity period
- 保証期間: warranty period
- 試用期間: trial period
- 契約期間: contract term
COMMON EXPRESSIONS:
- 長い期間: a long period
- 短い期間: a short period
- 一定期間: a fixed period
RELATED WORDS:
- 期限: deadline, expiration date
- 時期: time, season, period
- 間/間: duration