What language is this word in gledileg jol?

The phrase "gledileg jol" is most likely from Esperanto, an artificial constructed language.

Here's why:

* "gledileg" is a word in Esperanto that means "joy" or "happiness".

* "jol" is also a word in Esperanto that means "joy" or "fun".

Therefore, the phrase "gledileg jol" likely translates to something like "joyful joy" or "joyful fun" in Esperanto.