'THE' bigger problem with definition
Literally the problem is the word 'the'.
Saying things like "my data is in the cloud" is causing confusion among the end user, by which I mean office workers storing their files and using cloud hosted applications.
The confusion that it causes is, I've found, quite a number of them believe there is just one computing cloud that spans the whole world and everything cloud related is in it. They think Office 365, Dropbox, their Google Play music and our own internal servers are all part of this "The Cloud".
It creates unreasonable expectations of how they want things to work, and also feeds fears some have about Google stealing their work when they save it.
I know I'm asking the impossible but I'd like to see corporate marketing and advertising, particularly that aimed at the end user with limited knowledge, stop referring to their services as being "in the Cloud" and start referring to them as "Microsoft's Cloud services" (replace with relevant vendor name).