Full Idea
If one were wondering whether truth should be considered a legitimate notion at all, a definition might be useful in dispersing doubts about its legitimacy.
Gist of Idea
If people have big doubts about truth, a definition might give it more credibility
Source
Volker Halbach (Axiomatic Theories of Truth [2011], 3)
Book Reference
Halbach,Volker: 'Axiomatic Theories of Truth' [CUP 2011], p.15
A Reaction
Halbach is proposing to skip definitions, and try to give rules for using 'true' instead, but he doesn't rule out definitions. A definition of 'knowledge' or 'virtue' or 'democracy' might equally give those credibility.
Related Idea
Idea 16303 Tarski made truth respectable, by proving that it could be defined [Tarski, by Halbach]