According to Tolkien, this is the proper noun form of the adjective adûn “west” (SD/435), though adûn is used as a noun in some examples as well.
Quenya
andúnë
place name. The West
Element in
- Q. Andúnë pella Vardo tellumar nu luini “beyond the West, beneath the blue vaults of Varda” ✧ LotR/0377; RGEO/58
- Q. Andúnë pella Vardo nu luini tellumar “West beyond [the borders of] Varda’s under blue domes” ✧ RGEO/58
Elements
Word Gloss andúnë “sunset, evening, (orig.) going down; west” Variations
- Andúne ✧ PE17/064
- Àndū́ne ✧ RGEO/58
- Andūne ✧ RGEO/58
A name for the Uttermost West as a region, appearing in the Namárië poem (LotR/377). It is simply andúnë “sunset, west” used as a proper name.