mail merge <messaging> A function of some {word processing} software (e.g. {Microsoft Word}) that produces multiple instances of a document by substituting different text strings from a {database} in place of certain field markers. This is often done with envelopes, resumes, spam, and various other mass mailings. (http://mtroyal.ab.ca/programs/academserv/ADC/workshops/staff/mail_merge/mail_merge_tutorial.html). (2002-07-26)