What is the meaning of Celtic words sine fine?

The phrase "sine fine" is actually Latin, not Celtic. It means "without end" or "forever."

Here's a breakdown:

* Sine: Latin preposition meaning "without"

* Fine: Latin noun meaning "end"

Therefore, "sine fine" literally translates to "without end."

While "sine fine" is a Latin phrase, it's possible that it could have been adopted into the vocabulary of Celtic languages, particularly in areas where Latin was historically influential. However, it wouldn't be considered a "Celtic word" per se, but rather a borrowed term.