The biggest linguistic unit of India is?

The biggest linguistic unit of India is not a single language, but rather a language family. This would be the Indo-Aryan language family.

Here's why:

* Indo-Aryan languages are spoken by the vast majority of Indians, encompassing Hindi, Bengali, Marathi, Punjabi, Gujarati, and many others.

* While there are other language families in India (like Dravidian, Austroasiatic, Tibeto-Burman), the Indo-Aryan family is significantly larger in terms of speakers and geographical distribution.

Therefore, while "Indo-Aryan" is technically a language family, it represents the largest linguistic unit in India.