A more thorough explanation:

Definition: Res nova is a Latin term that means "new thing" or "first impression".

Example: When a new product is launched in the market, it is a res nova for the customers. They have never seen or used it before, so it is their first impression of the product.

Explanation: Res nova refers to something that is new or unfamiliar, and it can be applied to various situations. In the example given, the launch of a new product is a res nova for the customers because they have never seen or used it before. It is their first impression of the product, and they will form an opinion based on this initial experience.