Definitions

1. pronoun

used to indicate a thing or person that is selected or chosen, often in a casual or indefinite way

“I’ll take whichever book you recommend.”

2. adjective

used to describe or indicate something that can be chosen or selected

“I’ll buy whichever flavor of ice cream you want.”

3. noun

a person or thing that can be chosen or selected

“She chose the winner, and the winner was whichever athlete scored the most points.”