noun
transition period; period of transition
Used for a defined period during which a system, rule, or organization changes from one state to another. Common in business, IT, and legal contexts.
新システムへの移行期間は3か月を予定しています。
We plan a three-month transition period to the new system.
移行期間中は、旧制度も併用されます。
During the transition period, the old system will also be used.
Compound of 移行 (transition) and 期間 (period).