What does deion mean in Greek?

There isn't a single Greek word "deion" that has a standard meaning. It's possible:

* It's a misspelling or a variation of a Greek word: Could you be thinking of a similar-sounding word? Providing more context (where you encountered this word) would be helpful.

* It's a modern coinage: Some words are created by combining Greek roots or modifying existing ones. Without more information, it's impossible to say what it might mean in that context.

To help me understand, please tell me where you saw or heard the word "deion."