* Εορτή (eortí): This is a general term for a feast or festival, often religious. It's a good choice for a formal or religious celebration.
* Γιορτή (giortí): Similar to εορτή, but more commonly used for a festive occasion, a party, or a celebration in general. It's probably the closest single-word equivalent for most uses of "celebration."
* Πανηγύρι (panigýri): This refers to a large, public celebration, often with a religious or cultural significance.
* Αγώνας (agónas): While literally meaning "contest" or "competition," it can also refer to a celebratory event, especially if it involves games or competitions as part of the celebration (like the ancient Olympic Games).
* You could also use a phrase, such as εορτασμός (eortasmós) της [event] which translates to "celebration of [event]". This is a more formal and descriptive option.
Therefore, γιορτή (giortí) is likely the closest single-word translation for most contexts, but the best choice will depend on the specific kind of celebration you're referring to.