1. In marketing research, placing a set of questions on a mailed omnibus questionnaire containing questions from various sponsors. 2.
  2. In direct mail/direct response marketing, bounceback, co-op mailing, third-party or swap mailing when a mail shot is inserted with another non-competi­tive mailing, e.g. gas/electricity/credit card bills.
  3. Sale of extra items such as accessories.
  4. Term for joining together two TV commercials.

Synonyms: swap mailing, third-party mailing

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