From Old Turkic [script needed] (-lar), of uncertain origin, but thought to be of Common Turkic origin that was absent from Proto-Turkic, as it is not found in the sister Oghur branch (namely Chuvash). Often thought to be derived from a grammaticalized form of *olar (modern onlar (“they”)), from ol (modern o (“it, he, she”)) + *-ar (hypothesized by some to be the original Common Turkic plural suffix).
- Used to form plurals of nouns.
- It's used when the noun's last vowel is a back vowel.
- When the noun's last vowel is a front vowel, "-ler" is used instead.