ただし

conjunction

but; however; provided that

Used to add a condition, exception, or limitation to a preceding statement. Often introduces a proviso or caveat.

• 明日あしたは遠えん足そくに行いきます。ただし、雨あめが降ふったら中ちゅう止しです。

  We will go on the excursion tomorrow. However, if it rains, it will be cancelled.