The oldest layer of the Nuristani lexicon is the common inheritance from
Proto-Indo-European, shared with other
Indo-European languages. For example,
Tregami tre is cognate with English
three, Russian
три (tri), and Spanish
tres. Much of the Nuristani lexicon traces back to the
Proto-Indo-Iranian language of the late 3rd millennium BCE (compare the
Ashkun ćës—"markhor hair" and the
Marathi kes—"hair"). Due to the relative isolation of the
Nuristan region until the turn of the 20th century, the Nuristani languages were thought to have retained some inherited words from the ancient
Indo-Iranian religion, predating
Hinduism and
Zoroastrianism. However, recent research on Nuristani
theonyms shows robust semantic and linguistic correspondences with
Indo-Aryan religious terminologies, which points to a significant
post-Vedic Hindu influence on Nuristani theology and religious vocabulary. Remnants of inherited Indo-Iranian elements may have survived in some
Prasun theonyms with hitherto unknown etymologies. Nuristani-speaking peoples have since long participated in enduring social contact with Indo-Aryan speakers, leading to a large number of early Indo-Aryan loanwards and relative semantic closeness among the shared cognates between Indo-Aryan and Nuristani languages. There have been important historical exchanges between the Nuristani religious practices and earlier forms of Hinduism. For instance, the
Katë Indrë may be linked to the Hindu deity
Indra, from which it derives the Katë
indrõ—"rainbow" ("Indra's bow") and
indrëṣ—"earthquake" ("Indra's impulse).
Middle Indo-Aryan languages like
Gandhari have shared a broader cultural and linguistic milieu with Nuristani languages for many centuries in the
Gandhara region. In addition, Nuristani languages borrowed words for "law" and "judge" from the Iranian
Bactrian language around the 1st century CE, suggesting some degree of contact with Bactrian-speaking state institutions, possibly the
Kushan Empire. The most recent influx of loanwords into Nuristani is from
Persian and
Pashto, since the incorporation of
Nuristan Province into Afghanistan in the 1890s. The chart below compares some basic vocabulary among the modern-day Nuristani languages. ==Syntax==