in advance; beforehand; ahead of time
Used when an action is done before a particular event or point in time, often to prepare or inform. Common in both spoken and written Japanese.
Please send the meeting materials in advance.
前もって連絡すれば、スムーズに対応してもらえます。
If you contact them beforehand, they will handle it smoothly.
You should make a reservation in advance.
I let everyone know the meeting time in advance.
I prepared the things I needed for the trip beforehand.