It was with Patañjali that the Indian tradition of language scholarship reached its definite form. The system thus established is extremely detailed as to shiksha (phonology, including accent) and vyakarana (grammar and morphology). Syntax is scarcely touched, because syntax is not important in this highly inflexional language, but nirukta (etymology) is discussed, and these etymologies naturally lead to semantic explanations. People interpret his work to be a defense of Pāṇini, whose Sutras are elaborated meaningfully. Patañjali also examines Kātyāyana rather severely. But the main contributions of Patañjali lies in the treatment of the principles of grammar enunciated by him.

Kātyayana introduced semantic discourse into grammar, which was further elaborated by Patañjali to such an extent that Mahābhāṣya can be called a mix of grammar as such as well as a philosophy of grammar. Kāśika-vritti by Jayāditya and Vāmana (mentioned by Itsing) included viewpoints of other grammarians also which did not conform to Patañjali's views. Many commentaries on Mahābhāṣya were written, of which Kaiyaṭa's commentary named Pradīpa (c. 11th century CE) is most celebrated.

Mahabhashya evam patanjali ke vyapak gevan drushti, Abhyarhita nyaya.