"chain letter." YourDictionary, n.d. Web. 16 September 2018. <http://www.yourdictionary.com/chain-letter>.
chain letter. (n.d.). Retrieved September 16th, 2018, from http://www.yourdictionary.com/chain-letter
A letter, email, or other message sent to a number of people asking each recipient to send copies with the same request to a specified number of others. The circulation of a chain letter increases in geometrical progression as long as the instructions are followed by all recipients.