Aryan language

Aryan language occurs in works published in the 19th century and 20th century to mean:

Very old Indo-European languages.

The Vedic Sanskrit language (Oldest Indo-Aryan language). The majority of North Indian languages are derived from Sanskrit (North India is also called as Arya-varta)
The Old Persian language
The Proto-Indo-Iranian language, the ancestral language of the Indo-Iranians.
In works published in the late 19th century and early 20th century, this term, or the term Proto-Aryan, was sometimes used to describe the Proto-Indo-European language.
In works published in the late 19th century and early 20th century, this term in the plural was sometimes used as a synonym for the Indo-European languages
The Avestan language

See also