You seem to be confusing definitions and concepts. Definitions are our best verbal description of our concepts, but they are not concepts. I think this is best thought of as an example of a map-territory confusion.
Also, many fields, especially your example of legal language, purposely limit meanings of their definitions for the purpose of greater precision and clarity, but more generally even definitions are fuzzy around the edges, though less so than concepts.
You seem to be confusing definitions and concepts. Definitions are our best verbal description of our concepts, but they are not concepts. I think this is best thought of as an example of a map-territory confusion.
Also, many fields, especially your example of legal language, purposely limit meanings of their definitions for the purpose of greater precision and clarity, but more generally even definitions are fuzzy around the edges, though less so than concepts.