あらかじarakajime
1.

In a manner that occurs prior to a specified action or event, allowing for preparation or anticipation of future circumstances.

2.

Reflecting a formal tone, this term indicates an action taken with prior knowledge or consent, often highlighting the importance of preparation before the main event.

3.

Pertaining to activities or arrangements made ahead of time, often to ensure smooth execution or to mitigate potential issues later on.

Example:

私たちはあらかじめスナックを用意しておいた。