Eru divine name "the One" = God (VT43:32, VT44:16-17), "the One God" (Letters:387), a name reserved for the most solemn occasions (WJ:402). Often in the combination Eru Ilúvatar, "Eru Allfather" (cf. MR:112). Genitive Eruo (MR:329, VT43:28/32), dative Erun (VT44:32, 34). The adjectival form Eruva "divine" (Eruva lissëo "of divine grace", VT44:18) would be identical to the form appearing in the possessive case. Compound nouns: Eruhantalë "Thanksgiving to Eru", a Númenórean festival (UT:166, 436), Eruhin pl. Eruhíni "Children of Eru", Elves and Men (WJ:403; SA:híni, cf. _Eruhîn _in Letters:345), Eruion *"son of God" (or "God the Son"?) (VT44:16), Erukyermë "Prayer to Eru", a Númenórean festival (UT:166, 436), Erulaitalë "Praise of Eru", a Númenórean festival (UT:166, 436), Eruamillë "Mother of God" (in Tolkien's translation of the Hail Mary, VT43:32, see also VT44:7), Eruontari, Eruontarië other translations of "Mother (Begetter) of God" (VT44:7, 18), Erusén "the children of God" (RGEO:74; this is a strange form with no plural ending; contrast the synonym Eruhíni.) #Eruanna and #erulissë, various terms for "grace", literally "God-gift" and "God-sweetness", respectively (VT43:29; these words are attested in the genitive and instrumental case, respectively: Eruanno, erulissenen).
Noldorin
eru
noun. waste, desert
Eru
noun. waste, desert
min
fraction. one (first of a series)
min
cardinal. one
A noun in The Etymologies of the 1930s glossed “waste, desert”, the cognate of ᴹQ. erume and a derivative of the root ᴹ√ERE “be alone, deprived” (Ety/ERE).
Conceptual Development: N. eru is probably a later iteration of G. ermin “desert, waste” from Gnomish Lexicon Slips of the 1910s (PE13/113), itself replacing G. armin with the same gloss from the Gnomish Lexicon (GL/20). These 1910s forms are probably derived from the early root ᴱ√ARA “be dry” (QL/32), with G. ermin the result of *i*-affection.