For some reason there are times and contexts where we do not accept the idea that there should ever be more than one way of defining an activity or a process. There are innumerable ways of defining the same thing in nature: different life forms will literally see things differently. From the outset, we need to distinguish measurements (in a standard unit) from expressions of quality (descriptive). Providing the unit of measurement is agreed explicitly in advance, there is not a lot to go wrong. This is one of the lessons that the development teams for the Hubble deep space telescope learnt the hard way.
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