Whichever (determiner)

1. Used to refer to any one of a number of things or people, no matter which.
2. Used to indicate that a choice can be made between two or more options and it doesn't matter which one is chosen.

Origin:

From which + ever (adverbial form of the word "eve.r")

Examples:

1. Take whichever book you want.
2. Whichever team wins, I'll be happy.
3. I'll eat whichever sandwich is ready first.
4. You can go to whichever party you want.
5. Whichever road you take, you'll end up at the same place.