Though attested in LotR, this word might relate to ae.1 , with the regular change from ai to ae between Noldorin and Sindarin
Sindarin
ah
preposition/conjunction. and, with
ah
conjunction. and
adh
conjunction. and
ahamar
noun. neighbour
ahamar
noun. *neighbor
ai
interjection. ah!
ai na vedui dúnadan
Ah! at last, Dúnadan!
alae!
ah
! (interjection) alae!
alae!
ah
a
conjunction. and; †by, near, beside
In The Lord of the Rings, the Sindarin conjuction for “and” was a, as seen in the famous phrase from the Moria Gate Inscription: pedo mellon a minno “speak, friend, and enter” (LotR/305).
Conceptual Development: In Tolkien’s earlier writings, the word for “and” was usually ar, consistent with the usual Quenya form of this word: Q. ar. The first appearance of this form of the word was in the Gnomish Lexicon of the 1910s, which had G. ar “and, too” (GL/20). This version of “and” appeared in numerous phrases from the 1920s-50s, that latest being the Sindarin version of the Lord’s Prayer: Ae Adar Nín from the mid-1950s (VT44/21).
In Lord of the Rings drafts of the 1940s, however, Tolkien introduced a “and” in the initial versions of the gate inscription (TI/182). He gradually transitioned to the a version over the next few years.
Possible Etymologies: It is not obvious what Tolkien intended the etymology of S. a “and” to be when he first introduced it. He did revisit the question in notes on Words, Phrases and Passages from the Lord of the Rings (WPP) from the late 1950s or early 1960s, where he considered two primitive forms: ✶as(a) and ✶ad(a) (PE17/41). In both cases, the consonant of the primitive word would vanish if the following word began with a consonant, either as > ah > a or ad > að > a. However, there would be remnants of the primitive consonant before words beginning with a vowel, such as ah Edhel or að Edhel “and an Elf”. This is similar to how the English indefinite article “a” is “a” before a consonant but “an” before a vowel.
In the previously mentioned note Tolkien eventually settled on a(ð), and this was also the etymology of “and” in Quenya Notes (QN) from 1957 (PE17/145). In writings elsewhere Tolkien seems to have used a(h). For example, ah appeared in the phrase Athrabeth Finrod ah Andreth “The Debate of Finrod and Andreth” written around 1959 (MR/329). In notes from 1968, Tolkien had Common Eldarin as “and” producing S. ah which became a before consonants (VT43/30).
Possible Mutations: In notes from 1969, Tolkien said that conjunctions like “and, or” induced mutation in Sindarin (PE23/142). The exact mutation would depend on the etymology of the word. The a(ð)-variant would induce stop mutation and the a(h)-variant would induce sibilant mutation, as described in Tolkien’s notes on the etymology of this word mentioned above (PE17/41).
One complication for the etymology of a was the phrase Daur a Berhael, Conin en Annûn “Frodo and Sam, princes of the west” (LotR/953). Here the name Perhael “Samwise” clearly undergoes soft mutation. Tolkien noticed this in his notes on the phrase, saying: “a·Berhael. ‘And’ cannot therefore be [derived from] arĭ! aŋa. ā̆. {an >>} ŋ̃a [and later in the same context] ‘And’ ad(a). Q ar. N [sic., should be S] a(ð). a, að before vowel. with soft mutation” (PE17/102).
However, there are no signs of soft mutation after a in other phrases like pedo mellon a minno [rather than vinno] (LotR/305) or si loth a galadh lasto dîn [rather than ’aladh] (LB/354). The earlier ar-variant also seems not to have induced mutation in some documents, such as the King’s Letter [ar Hîr; ar Meril] (SD/128) or Ae Adar Nín [ar díheno] (VT44/21, 28-29).
In the previously mentioned notes on Daur a Berhael, Tolkien seems to have considered another explanation where Daur “Frodo” was also a mutation, with an unmutated form Taur (PE17/102). If so, it may be that the mutations in Daur a Berhael are the result of some other grammatical operation rather than the normal mutation of a “and”.
Other than Daur a Berhael, the only clear example of consonant mutation after the conjunction “and” is ar·phent Rían... “✱and Rían said” from the Túrin Wrapper from the early 1950s (VT50/5). This seems to be an example of liquid mutation for the ar-version of this word.
Neo-Sindarin: For purposes of Neo-Sindarin, I prefer the a(h)-variant for Sindarin “and”, with sibilant mutation before consonants and ah before vowels. This variant appears in notes from 1968 (VT43/30) and the sibilant mutation occurs only before words beginning with p, t, c, h (→ ph, th, ch, ch) and l, r (→ lh, rh). That means conflict with unmutated examples is minimized. In earlier versions of Eldamo I recommended ignoring mutation entirely for a(h), but since PE23 made it clear that conjunctions induce mutation I now recommend the “least disruptive” mutation: sibilant mutation.
This means a separate explanation is required for Daur a Berhael. For purposes of Neo-Sindarin, I assume that soft mutation is used as a marker for Sindarin direct objects, even when those objects do not immediately follow the verb. Thus I assume Daur a Berhael are soft mutations of Taur “Frodo” and Perhael “Samwise” because they are the objects of the verb eglorio “glorify” in the phrase Daur a Berhael, Conin en Annûn, eglerio “Frodo and Sam, princes of the west, glorify (them)”.
Bear in mind that this system is based on a very small number of examples, and could be overturned by new publications.
a
conjunction. and
See ah for the form that this conjunction might take before a vowel
ar
conjunction. and
See ah for the form that this conjunction might take before a vowel
a
and
a, or ah when the next word begins in a vowel: Finrod ah Andreth, Finrod and Andreth. In some sources, Tolkien uses ar as the conjunction "and", but a(h) would seem to be the proper Sindarin form.
a
and
or ah when the next word begins in a vowel: Finrod ah Andreth, Finrod and Andreth. In some sources, Tolkien uses ar as the conjunction "and", but a(h) would seem to be the proper Sindarin form.
sammar
neighbour
sammar (i hammar, o sammar), pl. semmair (i semmair). Also ahamar (pl. ehemair). Dual samarad, 2 neighbours (VT48:20)
sammar
noun. *neighbor
ceredir
maker
ceredir (i geredir, o cheredir) (doer), no distinct pl. form except with article (i cheredir)
hîth
mist
hîth (i chîth) (fog), no distinct pl. form, not even with article (i chîth).
mîr
treasure
mîr (i vîr, construct mir) (precious thing, jewel), no distinct pl. form except with article (i mîr), coll. pl. míriath.
thavron
wright
thavron (carpenter, builder), pl. thevryn, coll. pl. thavronnath.
tân
maker
1) ?tân (i dân, o thân), only attested as -dan or -than as the final element of compounds, e.g. Círdan ”Ship-maker”). Construct tan, pl. tain (i thain), 2)
a
and
a
and
conj. and. About his mutation, see PE17:145.
a
conjunction. and
conj. and. Pedo mellon a minno! 'Say friend and enter'. Q. ar
ad
conjunction. and
ada
conjunction. and
anor
noun. Sun
The most common Sindarin name for the Sun derived from primitive ✶Anār, an augmented form of the root √NAR “fire” (PE17/38; Ety/ANÁR; SD/302-303, 306). The o is the result of ancient ā becoming au and then this au becoming o in polysyllables.
Conceptual Development: The term Anor was first mentioned in conjunction with early tales of Númenor (LR/41). It briefly appeared as N. {ánar >>} Anar “sun” in The Etymologies of the 1930s under the entry for ᴹ√NAR (Ety/NAR¹; EtyAC/NAR¹), but as Anor under ᴹ√ANÁR (Ety/ANÁR). In The Notion Club Papers of the 1940s it was Anor, archaic †Anaur (SD/302-303, 306) and it retained this form thereafter.
ar
conjunction. and, and, [G.] too, besides
hithlain
noun. mist-thread (a substance used by the Elves of Lothlórien to make strong ropes)
hîth
noun. mist, fog
hîth
noun. mist
The Sindarin word for “mist”, an element in many names, derived from the root √KHITH of the same meaning (SA/hîth; PE17/73).
Conceptual Development: N. hîth “mist” appeared in The Etymologies of the 1930s, already with the derivation given above (Ety/KHIS), though when Tolkien first defined the word, he first wrote (and then deleted) the gloss “fog” (EtyAC/KHIS). In The Etymologies as published in The Lost Road, Christopher Tolkien wrote hith (LR/364), but Carl Hostetter and Patrick Wynne confirmed that the actual form was hîth in their Addenda and Corrigenda to the Etymologies (VT45/22).
oroth
noun. rage
samarad
noun. two neighbours
sammar
noun. neighbour
Ídh
and
{ð}_ conj. _and. It was not mutated before vowels. >> a
Ídh
and
Ídh
and
{ð} conj. and. About his mutation, see PE17:145.
anor
sun
(pl. Anoer if there is a pl.) Archaic Anaur (SD:306).
ceredir
maker
(i geredir, o cheredir) (doer), no distinct pl. form except with article (i cheredir)
círdan
shipwright
(i gírdan, o chírdan) (shipbuilder), pl. círdain (i chírdain). Compare Círdan as a proper name.****
gwist
noun. change
hithlain
mist-thread
name of a fiber made in Lórien.
hîth
mist
(i chîth) (fog), no distinct pl. form, not even with article (i chîth).
mith
wet mist
(i vith) (white fog), no distinct pl. form except with article (i mith). David Salo would read mîth with a long vowel. Note: a homophone is the adjective ”pale grey”. ✱
mîr
treasure
(i vîr, construct mir) (precious thing, jewel), no distinct pl. form except with article (i mîr), coll. pl. míriath.
naur
sun
(mainly in compounds as nar-, -nor) (flame, fire), pl. noer, coll. pl. norath.
thavron
wright
(carpenter, builder), pl. thevryn, coll. pl. thavronnath.
tân
maker
(i dân, o thân), only attested as -dan or -than as the final element of compounds, e.g. Círdan ”Ship-maker”). Construct tan, pl. tain (i thain)
The title Athrabeth Finrod ah Andreth is translated as "converse of Finrod and Andreth", but some scholars actually believe this word to be unrelated with the conjunction a.1 , ar "and", and they render it as "with". Other scholars consider that "and" and "with" (in the comitative sense) are not exclusive of each other, and regard ah as the form taken by this conjunction before a vowel. That a, ar and ah are etymologically related has finally been confirmed in VT/43:29-30. Compare also with Welsh, where the coordination "and" also takes different forms whether it occurs before a vowel or a consonant (respectively ac and a). In written Welsh, a often triggers the aspirate mutation: bara a chaws "bread and cheese". This usage is seldom applied in colloquial Welsh (Modern Welsh §510)