I would define street photography as something along the lines of “photography within an uncontrolled environment and inclusive of spontaneous aspects within the process and preparation of producing of the image.”
To me, street photography is intended to be spontaneous, in which many ideas are formed from the discovery of exciting elements, and such ideas are eventually combined when each individual piece falls into place when the photograph is taken. Of course, many times, street photography contains elements of preparation as well, such as fishing/preparing for a shot by waiting or planning, but it still includes spontaneous elements, such as waiting for a person/subject in the picture.
I believe that my definition is more inclusive of the varying styles of street photography. Although this definition does not fully encapsulate the contemporary or “raw” nature of street photography, but I think that this definition allows for greater interpretation with street photography and (possibly) greater interpretation of the purpose of street photography.