Definition of "chain letter" []

• A letter 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. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.