I just try to find what the definition of CMS by Googling with keyword define:CMS. The result give me 27 definitions about CMS. But, the definition of CMS I mean is only fullfilled by 7 ones.
Here is it :
system for the creation, modification, archiving and removal of information resources from an organised repository. Includes tools for publishing, format management, revision control, indexing, search and retrieval. Source
In the context of a Web site a CMS is a collection of tools designed to allow the creation, modification organisation and removal of information from a Web site. It is common for a CMS to require users to have no knowledge of HTML in order to create new Web pages. Source
Content Management System. A browser based interface which allows the owner to update the content of their web site whenever they want. Source.
Imagine being able to make changes to your Website without knowing HTML. A content management of a business's Website should be controlled by its internal staff. Redfern has developed proprietary software to update a Website using a browser-based content management system. Source.
Often Internet-based, software allowing instructors to manage materials distribution, assignments, communications and other aspects of instruction for their courses. An example is Blackboard. Source.
Infrastructure system that is used to store and retrieve information on a website. Source.
"Content Managing System". A system whereby users can log in and update their website online. The content is usually stored in a database and the HTML is created dynamically on request. Source.
As usual, there is no exact definition...