envelope

US /ˈɛnvəˌloʊp/

Definition

a flat paper container used for sending letters, invoices, or notices

Appears in office mail services and formal correspondence.

She placed the signed contract in an envelope and sealed it.

Easy sealed envelope
a paper mailing sleeve fastened shut with adhesive
Medium return envelope
a pre-addressed mailing packet supplied for customer replies
Hard manila envelope
a large, sturdy paper packet used for storing important documents
Very Hard push the envelope in design
challenging accepted boundaries to pioneer innovative creative styles

Learner's English edition · Curated definitions for TOEIC learners.