Ilmarin noun "mansion of the high airs", the dwelling of Manwë and Varda upon Oiolossë (SA:ilm-)
Quenya
ilmarin
place name. Mansion of the High Airs
Ilmarin
mansion of the high airs
ilm-
mansion of the high airs
ilm- stem appearing in Ilmen, the region above the air where the stars are, in Ilmarë, name of a Maia, and in Ilmarin "mansion of the high airs", the dwelling of Manwë and Varda upon Oiolossë (SA)
The mansion of Manwë and Varda on Taniquetil, translated as “mansion of the high airs” (LotR/235, RC/217). The etymology of this name is unclear, but it is probably derived from Ilma “Starlight”, and related to Ilmen “Place of (Star)light” (SA/ilm).
Conceptual Development: The name ᴹQ. Ilmarin first appeared in Lord of the Rings drafts from the 1940s (TI/92). It did not appear in The Silmarillion proper, though it was discussed by Christopher Tolkien in The Silmarillion index and appendix (SI/Taniquetil, SA/ilm).