Quenya 

neldëa

ordinal. third

The usual Quenya word for “third” was neldea as an adjectival form of neldë, along with an alternate (archaic?) form nelya of the same meaning (VT42/25).

Conceptual Development: In the Early Qenya Grammar (EQG) of the 1920s, ᴱQ. nelya was the normal word for “third” (PE14/51, 82).

neldëa

third

neldëa ordinal "third" (VT42:25); also nelya. Cf. neldë.

nelya

third

nelya adj. "third" (VT42:25; also neldëa). Pl. Nelyar "Thirds", the original name of the Teleri (or rather the direct Quenya descendant of the original Primitive Quendian name) (WJ:380).

nelya Archaic

ordinal. third