letter book

noun

: a book in which letters or copies of letters are kept especially to provide a running account of a business or enterprise

the general's letter books give an intimate picture of the campaign

Word History

First Known Use

1667, in the meaning defined above

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now