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Full Idea
We can define, it would seem, a strong synonymy relation for single words by them being interchangeable salva veritate.
Clarification
'Salva veritate' means truth-preserving
Gist of Idea
Single words are strongly synonymous if their interchange preserves truth
Source
Willard Quine (Philosophy of Logic [1970], Ch.1)
Book Ref
Quine,Willard: 'Philosophy of Logic' [Prentice-Hall 1970], p.8
A Reaction
This is a first step in Quine's rejection of synonymous sentences. He goes on to raise the problem of renate/cordate. Presumably any two word types can have different connotations, and hence not always be interchangeable - in poetry, for example.