letter
1 character, sign, symbol
2 acknowledgment, answer, billet (archaic) communication, dispatch, epistle, line, message, missive, note, reply
3 to the letter accurately, exactly, literally, precisely, strictly, word for word
English Collins Dictionary - English synonyms & Thesaurus  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"