Regardless of the definition you’ll read or try to tweak, it will be one that fits into the following 6 (valid and viable!) concepts of CRM:
(Social) CRM as a process (or function)
(Social) CRM as a strategy
(Social) CRM as a philosophy (or mindset or logic)
(Social) CRM as a (cap)ability
(Social) CRM as a technology
(Social) CRM as a practice (or as practices)
OR, as a combination of all or some of the above concepts, in a non-alphabetical order.