* If you mean "average": The Greek word is μέσος όρος (mésos óros), literally "middle term".
* If you mean "cruel" or "unkind": Several words could apply, depending on the nuance: κακός (kakós - bad, evil), κακονόητος (kakonóētos - malicious), σκληρός (sklīrós - harsh, cruel), άδικος (ádikos - unjust).
* If you mean "to signify" or "to intend": σημαίνει (simaínei) - means, signifies. Or εννοώ (ennōō) - I mean.
* If you mean "lowly" or "of little importance": τάπεινος (tápeinos) - humble, lowly.
To get a more precise translation, you need to provide the sentence or context in which you are using the word "mean."