1. Used to emphasize something extremely unlikely, but you don’t care to find out the actual probability of said event. (Same with, “one in a billion” and “one in a trillion”)

2. A song and Album by Aaliyah.
1. John: “Are you sure this is safe?”
Doe: “Yeah, the chances of anything going wrong are like, one in a million.”

2. Jane: “ One In A Million by Aaliyah was an amazing song”
by Glockumentary November 14, 2021
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You bring out the best in me. You make me a better version of myself. You're one in a million.
by Out&About November 29, 2021
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