Elen síla lúmenn’ omentielvo

Elen síla lúmenn’ omentielvo is a Quenya greeting used by Frodo in the first meeting with Gildor Inglorion. It translates as "A star shines on the hour of our meeting".

Without the vocal assimilation it would be Elen síla lúmenna omentielvo, which Tolkien also translates as "A star shines upon the hour of the meeting of our ways".

Someone asked J.R.R. Tolkien what was The Lord of the Rings about, if it was an "allegory", and he explained him that he was just trying to create a situation where Elen síla lúmenn’ omentielmo would be a common greeting, and that the phrase long antedated the book. (The letter gives the form omentielmo, which was the early form used in the first edition).