What is the Translation and meaning for word thank you in greek?

The most common way to say "thank you" in Greek is:

* Ευχαριστώ (Efharistó): This is the standard, versatile form used in most situations. It's a contraction of "ευχαριστώ σε" (efharistó se), literally meaning "I thank you."

There are other ways to express gratitude depending on context and formality, but Ευχαριστώ is the one you'll use most often.