The term 'in existence' can be expressed in four letters as 'ESSE, ' five letters as 'BEING, ' and eight letters as 'EXISTENT.' This phrase is used to describe something that exists or is present in the world. It is often used to refer to physical objects, but can also be used to describe abstract concepts such as ideas, beliefs, and emotions. In essence, it is a way of saying that something is real and tangible.