What is the greek word for identity?

There isn't one single perfect Greek word for "identity" in the modern sense of the term. The meaning depends heavily on the context. However, several words could be used depending on the nuance:

* ταυτότητα (tautótita): This is the modern Greek word borrowed directly from French, and is the closest single word translation. It's the most common and straightforward choice.

* ἰδιότης (idiotēs): This word refers to "peculiarity," "individuality," or "distinctive quality." It gets closer to the sense of personal identity but lacks the modern connotations.

* εαυτός (eautós): This means "self" and could be used in the context of self-identity, but it’s not a direct translation.

* πρόσωπο (prósopo): This word means "face" or "person" and can sometimes be used to refer to identity, particularly in a social or legal context.

Therefore, the best choice depends entirely on the context. For most general situations, ταυτότητα (tautótita) is the most appropriate.