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Maybe your own level of abstact language is confusing you? What you are saying is that when you want to measure ("quantify") something, you need to know what it is that you want to measure ("defin...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/32720 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Maybe your own level of abstact language is confusing you? What you are saying is that when you want to measure ("quantify") something, you need to know what it is that you want to measure ("definition given"). To substantiate that claim, you can now research both theory of measurement and theory of definition. But I would say that this statement is so commonsense that it needs no citation – after all, how would you measure something if you didn't know what you were measuring.