Full Idea
The only sort of sameness of meaning we know is similarity in meaning, not exact sameness of meaning.
Gist of Idea
There is only similarity in meaning, never sameness in meaning
Source
Gilbert Harman (Thought [1973], 6.8)
Book Reference
Harman,Gilbert: 'Thought' [Princeton 1977], p.109
A Reaction
The Eiffel Tower and le tour Eiffel? If you want to be difficult, you can doubt whether the word 'fast' ever has exactly the same meaning in two separate usages of the word.