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mail-in

[meyl-in]
adjective
  1. conducted or responding by mail: a mail-in referendum.
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noun
  1. something conducted or returned by mail, as a questionnaire or vote.
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Origin of mail-in

adj., noun use of verb phrase mail in
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for mail-in

Contemporary Examples of mail-in