Could you give examples?
I don't see why that's relevant to clarify, but I'll give it my best shot.
-There is no possible ambiguity about a "standard number"- 1, 2, 3, etc. If you specify that decimal numbers, 0, and negative numbers don't count, no more definition would be needed. A system which includes decimal numbers and negative numbers need only clear up ambiguities, say about irrational numbers, and it will work as a working "definition". -Take a hypothetical world where the word "sport" is used to refer only to football, soccer, and basketball,...
I'm not sure about this, but presenting it anyway for scrutiny.
I was thinking that it doesn't matter if a concept is undefined, or even cannot be defined, if hypothetically speaking said concept can exist without any ambiguity within it then it is still a tenable concept. The implications, if this is true, would be that it would knock down Quine's argument against the analytic-synthetic distinction.
Your thoughts, Lesswrong?