-nen instrumental ending (pl. -inen, dual -nten, partitive pl. -línen). Attested in ambartanen, lírinen, lintieryanen, súrinen, parmanen; see ambar (#2), lírë, lintië, súrë, parma. Tolkien noted that "most nouns have an instrumental in -nen" (PE17:62), a wording suggesting that the form of the ending may vary; given the normal development ln > ld, it is possible that it would appear as *-den when added to a noun in -l (*macilden "with a sword").
Quenya
-inen
-inen
-nen
most nouns have an instrumental in -nen
ilqua
ilqa
ilqua ("ilqa")noun "everything" (IL, VT45:24), "all" (FS); ilquainen ("ilqainen") a word occurring in Fíriel's Song, translated "to all". It would appear to be ilqua "all" with a dative pl. ending. However, in Tolkien's later Quenya -inen is the ending for instrumental pl. (FS)
linya
pool
linya noun "pool" (LIN1)
lóna
pool, mere
lóna (1) noun "pool, mere" (VT42:10). Variant of lón, lónë above?
mat
meal, meal time
mat (matt-) noun "meal, meal time" (QL:59)
mulë
meal, grist
mulë noun "meal, grist" (PE17:115, 181), replacing polë, q.v.
mulë
noun. meal, meal, *grist, ground grains
nendë
pool
nendë (1) noun "pool" (NEN), "lake" (PE17:52)
polë
meal, grist
[polë (stem poli-) noun "meal, grist" (PE17:115, 181), a word Tolkien decided to replace by mulë; perhaps polë was a variant of porë.]
-inen pl. instrumental ending. In ómainen (WJ:391)