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Full Idea
A traditional definition requires that the definiendum contains the defined term, that definiendum and definiens are of the same logical category, and the definition is conservative (adding nothing new), and makes elimination possible.
Gist of Idea
Traditional definitions need: same category, mention of the term, and conservativeness and eliminability
Source
Anil Gupta (Definitions [2008], 2.4)
Book Ref
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.13