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Full Idea
It doesn't follow from the fact that a given sentence is being used to implicitly define one of its ingredient terms, that it is not a factual statement. 'This stick is a meter long at t' may define an ingredient terms and express something factual.
Gist of Idea
A sentence may simultaneously define a term, and also assert a fact
Source
Paul Boghossian (Analyticity Reconsidered [1996], §III)
Book Ref
-: 'Nous' [-], p.14
A Reaction
This looks like a rather good point, but it is tied in with a difficulty about definition, which is deciding which sentences are using a term, and which ones are defining it. If I say 'this stick in Paris is a meter long', I'm not defining it.