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Sindarin was the Elvish language most commonly spoken in Middle-earth in the Third Age. It was the language of the Sindar, those Teleri which had been left behind on the Great Journey of the Elves. It was derived from an earlier language called Common Telerin. When the Noldor came back to Middle-earth, they adopted the Sindarin language, although they believed their native Quenya more beautiful. Before the downfall, most of the Men of Númenor also spoke the language. Knowledge of it was kept in the Númenórean realm-in-exile Gondor, especially amongst the learned. Sindarin is the language referred to as "the Elven-tongue" in The Lord of the Rings.

Sindarin became the language of the Noldor because of the command of King Elu Thingol of Doriath. Upon learning of the Kinslaying at Alqualondë, he declared that Quenya, the language of the Noldor, should be prohibited in his lands. As the Noldor were dwelling in a Sindarin-speaking land, and because of the decree of Thingol though it did not directly affect them, they gradually switched entirely to Sindarin. Their names were also changed to Sindarin, such as Noldofinwë to Fingolfin, and Turukáno to Turgon.

Tolkien originally imagined that the language which would become Sindarin was spoken by the Noldor. However, Tolkien later decided that it was the language of the Sindar. For this reason it is called "Noldorin" in the older material, such as the Etymologies. When Noldorin became Sindarin, it also adopted some features of the originally unrelated language Ilkorin. Tolkien based the sound and some of the grammar of his Noldorin/Sindarin on Welsh, and Sindarin displays of the consonant mutations that characterise the Celtic (especially Brythonic) languages. The language was also probably influenced to an extent by the Germanic languages, as Tolkien was a scholar of both Old English and Old Norse.

Dialects
During the First Age there were several dialects of Sindarin:

- Doriathrin or the language of Doriath, a form of the language which preserved many archaic forms;
- Falathrin or the language of the Falas, later also spoken in Nargothrond;
- North Sindarin, the dialects originally spoken in Dorthonion and Hithlum by the Sindar, these dialects contained many unique words and were not fully intelligible with the Sindarin of Beleriand proper.

With the exception of Doriathrin, the dialects were changed under Noldorin influence, and adopted many Quenya features, as well as unique sound changes devised by the Noldor (who loved changing languages). The distinct dialects disappeared after the Noldor and Sindar were dispersed during the later Battles of Beleriand. In the refuges on the Isle of Balar and the Mouths of Sirion a new dialect arose under the refugees, which mainly took after Falathrin. During the Second Age and Third Age Sindarin was a lingua franca for all Elves and their friends, until it was displaced as the Common Tongue by Westron, a descendant of Adûnaic which was heavily influenced by Sindarin.

Sindarin is actually a Quenya term. No Sindarin word for Sindarin is known, but usually the term Edhellen ("Elvish") is used in Neo-Sindarin.

taken from the Tokiengateway.net Wiki: