If there is a standard definition, it involves computing that is not so much a product you have to install and maintain but a service you tap into like a utility.
The first are the global network banks which have a limited presence in lots of countries which they use to tap internationally minded companies and consumers: Citigroup, HSBC and Standard Chartered.
This series apparatus takes tap water as water source to produce pure water by mode of electric heating distilling. The water quality conforms to the standard of "China Pharmacopoeia" (95).