Borrowed from Classical Mongolian ᠰᠣᠶ᠋ᠤᠯ (soyul, “civilisation, the act of civilising”). Compare Mongolian соёл (sojol, “culture”) and Buryat соёл (sojol, “culture”).
сойл • (soyl) (Clear script spelling ᠰᡆᡕᡆᠯ (soyol))