Ae (Quenya?) noun "day" (LEP/LEPEN/LEPEK - ae was written over ar [# 2] in the names of the Valinorean week, but ar was not struck out.)
[ala (7) noun "day", also alan "daytime". The forms allen, alanen listed after these words could be inflected forms of them, genitive "of daytime", constracted (allen = al'nen) and uncontracted. However, Tolkien struck out all of this (VT45:13).]
ar (2) noun "day" (PE17:148), apparently short for árë, occurring in the names of the Valinorean week listed below. Tolkien indicated that ar in these names could also be arë when the following element begins in a consonant (VT45:27). Usually the word for "day" in LotR-style Quenya is rather aurë (or ré), q.v.
aurënoun. day, day (as opposed to night), daylight, sunlight, day(light), sunlight, day
ré noun "day" (of the sun), a full 24-hour cycle (Appendix D) composed of aurë (day, daylight) and lómë "night" (VT49:45). Short -rë in compounds like Ringarë (q.v.). Allative rénna (VT49:45).
rénoun. day, day (period from sunset to sunset), day in calendar
árë noun "day" (PM:127) or "sunlight" (SA:arien). Stem ári- _(PE17:126, where the word is further defined as "warmth, especially of the sun, sunlight"). Also name of tengwa #31; cf. also ar # 2. Originally pronounced ázë; when /z/ merged with /r/, the letter became superfluous and was given the new value ss, hence it was re-named essë (Appendix E)_. Also árë nuquerna *"árë reversed", name of tengwa #32, similar to normal árë but turned upside down (Appendix E). See also ilyázëa, ilyárëa under ilya. In the Etymologies, this word has a short initial vowel: arë pl. ari (AR1)
árënoun. day, sunlight, sunlight, warmth (especially of the sun)
In the Etymologies, this word has the sense “day” < ᴹ√AR¹ “day”, and it appears with this gloss in some later writings as well. By the time he was writing The Lord of the Rings appendices, though, Tolkien had changed the sense of this word to “sunlight” < √AS¹ “warmth”. This derivation is clear from the archaic form †ázë, whose [-z-] must developed from primitive intervocalic ✶[-s-]. The sense “day” was transferred to the word aurë and its shorter form ré.