Synonyms of 'to the letter'
▷ See letter
preciselyDictionary, strictly, literallyShe obeyed his instructions to the letter.
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The test can accurately predict what a bigger explosion would do.
Can you describe exactly what he looked like?
Thesaurus for to the letter from the Collins English Thesaurus
If you say that someone carries out instructions to the letter , you mean that they do exactly what they are told to do, paying great attention to every detail.