Better Definition 

Would the following definition be more accurate? It is the definition of ghost from How to Hunt Ghosts by Joshua P. Warren.

"...we can loosely define a ghost as some paranormal aspect of the physical form and/or mental presence that appears to exist apart from the original physical form.

The word appears is important to the above definition, for most encounters are perceived by the five senses alone, creating a subjective experience. Therefore, most information about ghosts is subjective.

And to Wikidudeman, I apologize if it is too long. ^_^