However, it's important to note that:
* Ancient Greek is a distinct language, no longer spoken, but the basis of Modern Greek.
* Greek dialects exist within Greece, and even in communities outside Greece, with varying levels of mutual intelligibility with Standard Modern Greek.
* Other languages are spoken by minorities in Greece, such as Turkish, Albanian, and Romani.
So, while the answer is primarily Modern Greek, the linguistic landscape of Greece is richer and more nuanced than a simple one-word answer.