I have always loved Enya and especially this song, and I came across the nicest video (with words) to go along with it.
They say the meaning behind it is that it is in fact, about The Evacuees. The children in the UK during World War II. They were sent away from the big cities that were constantly being bombed and sent to live with families in the country sides until the war ended.
My brother had recorded this on a cassette tape when my mother passed away with a collection of other songs. This song had a different meaning to us. It was ,to us, like saying goodbye and finally, letting her go- until we were all to meet again.
It is a beautiful song, and it can have it’s own personal meaning for whomever listens to it. Enjoy.