mail-in envelope
nounUK /ˈmeɪl ɪn ˈɛnvələʊp/
US /ˈmeɪl ɪn ˈɛnvəloʊp/
A special envelope you use to send something by mail.
She put her form in a mail-in envelope and dropped it in the mailbox.
RELATED WORDS
OTHER MEANINGS
2. An envelope included with a bill or form so the recipient can send payment or a reply back easily.
The bill came with a mail-in envelope for the payment.
3. An envelope designed to be filled out and mailed to enter a contest or survey.
He sealed his entry in the mail-in envelope for the sweepstakes.
4. An envelope pre-addressed to a company or agency for returning documents.
Use the mail-in envelope to return your signed contract.