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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.
(Communications & Information) a letter, often with a request for and promise of money, that is sent to many people who add to or recopy it and send it on to others: illegal in many countries
a letter sent to a number of people each of whom is asked to make and mail copies to others who are to do likewise.