Ashtadhyayi is a sanskrit treatise on grammar. It was written in the 6th to 5th century bce by the Indian grammarian Panini.
The Mahābhāsya is attributed to Patañjali, is a commentary on selected rules of Sanskrit grammar from Paṇini's treatise. It is dated to the 2nd century BCE.
Nirukta means "explained, interpreted" and refers to one of the six ancient Vedangas. Nirukta covers etymology, and is the study concerned with correct interpretation of Sanskrit words in the Vedas.
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