τετελεσται

How interesting it is to learn Greek as a reader of the New Testament.

τετελεσται:

• τε - reduplication prefix, done in the Greek perfect tense
• τελεσ - Greek perfect tense stem of τελεω (which means "I finish, fulfill"; the noun version is τελος, which means "end, goal"); perfect tense is translated in English using "has been (done)"
• ται - 3rd person singular ending, or "he/she/it", depending on context

So a literal translation of this word would be "he/she/it has been finished/fulfilled"; or in Jesus' case in John 19:30, "it has been finished" or "it is finished".