What is the meaning of block letter?

noun

WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). block letter. Retrieved September 20, 2026, from http://smartdefine.org/block_letter/definitions/1217789
ChicagoWordNet. 2010. "block letter" http://smartdefine.org/block_letter/definitions/1217789 (accessed September 20, 2026).
HarvardWordNet 2010, block letter, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/block_letter/definitions/1217789>.
MLAWordNet. "block letter" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/block_letter/definitions/1217789>