Premise vs. Premises in the Cloud

With all of the research I’ve been doing for our latest book:  Cloud Computing for Dummies, I’ve noticed something very disturbing.  Maybe it’s because I come from a telecommunications background, that this bothers me so much – but has anyone else noticed that people are misusing the word premise when describing aspects of the cloud?  I keep reading articles and blogs where an author refers to an “on premise” solution.  The proper term is premises as in – on your premises (see below).

From Dictionary.com

Premise:  a proposition supporting or helping to support a conclusion.

Premises:  a tract of land including its buildings.

 Even vendors in the space are making this mistake.  It’s appalling.  I could list dozens of examples of this error.  Has the definition of the word changed and I’m missing something?  Or, has the word been used incorrectly so many times that it doesn’t matter anymore?