- conducted or responding by mail: a mail-in referendum.
- something conducted or returned by mail, as a questionnaire or vote.
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
She dropped off her own mail-in ballot at the same time, according to the Arizona Daily Star.Democrat Ron Barber Retains Gabby Giffords’s Arizona Congressional Seat
Terry Greene Sterling
June 13, 2012
But the mail-in ballots that have begun flowing in over the past couple of weeks have been trending Republican.Has Obama Already Won?
October 29, 2008