The (English) Merriam-Webster dictionary seems to think it’s fine: https://www.merriam-webster.com/dictionary/not%20a/one
"It is not death that a man should fear, but he should fear never beginning to live." ~Marcus Aurelius
Game: "Characters with a height advantage against their opponents are harder to hit"
Me: "That's not true, and my short axeman is living proof!"
