yá (1) adv.? "formerly", also postposition (?) "ago" (YA). The form yá also appears as a variant of the relative pronoun ya, q.v.
Quenya
yá
when
yá
formerly
yá
conjunction. when
A relative conjunction “when” appearing in various phrases in Tolkien’s writings of the 1950s and 60s, a vowel-lengthened form of the relative pronoun ya.
Conceptual Development: Demonstrative, Relative, and Correlative Stems (DRC) from 1948 had ᴹQ. í glossed “(relative) at the time mentioned, at the same time”, a vowel-lengthened form of the relative pronoun ᴹQ. i (PE23/109). This was also given the gloss “when, whenever” in the Quenya Verbal System (QVS) from this same period (PE22/121). Earlier still, ᴹQ. íre was used as the relative conjunction “when” in Fíriel’s Song of the 1930s. In the Early Qenya Grammar it seems ᴱQ. yan “when” served this function (PE14/59).
sí ar lúmessë ya firuvammë: násië
now and at the hour of our death: Amen
The seventh line of Aia María, Tolkien’s translation of the Ave Maria prayer. The first few words are sí ar lúmessë “now and at [the] hour”, the last being a combination of the noun lúmë “time” (“hour”) and the locative suffix -ssë “at, in, on”. The next two words are a subordinate clause: ya firuvammë “✱when we will die”, the latter being future 1st-person-plural-exclusive form of the verb fir- “to die”. The last word, násië “Amen”, is also used by Tolkien in the Quenya prayer Átaremma.
Decomposition: Broken into its constituent elements, this phrase would be:
> sí ar lúme-ssë ya fir-uva-mmë: násië = “✱now and time-at when die-(future)-we: amen”
Less literally: “✱now and at the time when we will die”.
Conceptual Development: The first few words sí ar lúmesse are the nearly same in all versions of the prayer, except (a) the accents are omitted from si and lumesse in version I and (b) Tolkien considered and rejected a variant form are for ar “and” (as he did in line four).
In the first two versions of the prayer Tolkien used a Quenya word for “of our death”: fíriemmo (I) and effíriemmo (II). In both cases, the noun is (ef)fírie “death” with the first person plural exclusive possessive suffix -mma “our” and the genitive suffix -o “of”. In the version I, these forms were preceded by some incomplete and difficult-to-decipher forms; for details see VT43/27, 34-35.
The word násië “Amen” appears only in the last two versions of the prayer (III-IV).
| |  I  | II |III|IV| |si|sí| |ar|{are >>} ar|ar| |lumesse|lúmesse| |{urtulm >> urt >> menya >>}|i fíriemmo|effíriemmo|yá firuvamme|ya firuvamme| | |násie|
yá hríve menë, ringa ná
when winter comes/arrives/is with us, it is cold
yá tenn’ aldar lente landanóressë ólaner
when still trees grew free in a wide country
yá (2) conj. "when" in the sentence yá hrívë tenë, ringa ná "when winter comes, it is cold" (VT49:23). Compare írë #2.