In Jain philosophy:

• Chit means conscious / sentient — that which has knowledge, awareness, and consciousness.

In Jain terms, this refers to jiva.

• Achit means non-conscious / insentient — that which does not have consciousness.

In Jain terms, this refers to ajiva.

Simple meaning

• Chit = living soul, conscious being
• Achit = matter and other non-living substances

In Jain view

The jiva is chetan (conscious), while pudgala, dharma, adharma, akasha, and kala are achit (non-conscious).

If you want, I can also explain chit, achit, and mishra in Jain philosophy.