randomize
To mix or arrange things in a completely unpredictable way.
Randomize means to arrange things in an unpredictable order, without any pattern or plan. When you randomize a deck of cards, you shuffle them so thoroughly that nobody can guess which card will come next. When scientists randomize their test subjects, they assign people to different groups by chance rather than by choice, making sure the experiment is fair.
If you need to pick one student to go first but want to be completely fair about it, you might randomize the choice by drawing names from a hat or using a random number generator.
Video games often randomize where enemies appear or what treasures you'll find, making each playthrough feel different and surprising. Spotify can randomize your playlist so songs play in an unpredictable order. Teachers might randomize the questions on a test so students sitting next to each other get different versions.
Randomizing is useful whenever you want to eliminate bias or create variety. Scientists randomize their experiments to make sure their personal preferences don't accidentally influence the results. Game designers randomize elements to keep players interested and prevent them from memorizing patterns.