adverb

Beforehand means that you do something before something else happens. For example, if you are going to a party, you might clean your room beforehand so that it's all tidy when you get back.

Example

1. I made sure to check the weather beforehand so I was prepared for the rain.
2. I read the instructions beforehand so I knew exactly what to do.
3. I spoke to the interviewer beforehand to get a better idea of what to expect.