What is the meaning of Greek word good?

There isn't one single Greek word that perfectly translates to the English "good." The best translation depends heavily on the context. Here are a few options and their nuances:

* ἀγαθός (agathós): This is probably the closest general equivalent. It implies something morally good, virtuous, excellent, or beneficial. It's a broad term and can apply to people, things, or actions.

* καλός (kalós): This word means "beautiful," "fine," "noble," or "excellent." It often refers to aesthetic qualities or social standing, but can also imply moral goodness.

* σπουδαῖος (spoudaios): This word means "serious," "important," "worthy," or "respectable." It suggests something of high value or merit.

* χρηστός (chrēstós): This means "useful," "serviceable," or "kind." It emphasizes practical goodness or helpfulness.

The choice of which word to use in ancient Greek would depend on the specific shade of "good" intended. Simply saying "the Greek word for good" is insufficient; more context is necessary.