Cool air is a term used to describe air that is at a lower temperature than the surrounding environment. It is often used to describe air that is comfortable and refreshing, especially during hot summer days. The term 'cool air' can also be used to describe a style or attitude that is considered fashionable or trendy. In this context, the crossword solution for the term 'cool air' is 'HIPNESS', which is defined as being fashionable or stylish.