KUON?

So you know that song that plays when you start up the PS2 with FFX-2 in it, and the song that plays when you get an Episode Complete. I've seen in called several thing, all resembling "Eternity: Memory of Lightwaves" (also, Memory of Light and Wave, Memory of Wave and Light, ect ect.) Well I went to Luca Theatre on a New Game+ recently and the game calls the song "KUON: Memories of Waves and Light." So my question, what does KUON mean. Is it a word in another language? Is it referenced in the game somehow? Is it possibly an acronym since it's in all caps?

Thank you in advance.

what does KUON mean. Is it a word in another language?

- KUON is a Japanese word written in Romanji style and it means Eternity.
Romanji is a Japanese writing system in which words are written using the Roman alphabet. It can be used to write Japanese for foreigners and/or to write directly foreign words in a Japanese text. The other Japanese writing system are Hiragana, Katakana and Kanji and I'll just stop there before you'll have a headache ;)