Full Idea
Frege expressly denies that a correct definition need capture the sense of the expression it defines: it need only get the reference right.
Gist of Idea
A definition need not capture the sense of an expression - just get the reference right
Source
report of Gottlob Frege (Review of Husserl's 'Phil of Arithmetic' [1894]) by Michael Dummett - Frege philosophy of mathematics Ch.3
Book Reference
Dummett,Michael: 'Frege: philosophy of mathematics' [Duckworth 1991], p.32
A Reaction
This might hit up against the renate/cordate problem, of two co-extensive concepts, where the definition gets the extension right, but the intension wrong.