Rearview refers to something that is happening or has happened in the past, and can be used as a noun or an adjective. When used as a noun, rearview describes an object or event that is focused on what occurred previously, such as a rearview mirror which allows drivers to see what is behind them while driving forward. As an adjective, rearview refers to something that looks back at the past, like a rearview camera in a car that provides a view of what is happening behind it.