Meaning of the word envelopes in English

What does envelopes mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

envelopes

US /ˈɛnvəˌloʊps/
UK /ˈɛnvələʊps/

Plural Noun

flat, usually paper, containers for a letter or other documents, with a gummed flap for sealing

Example:
I need to buy some envelopes to mail these invitations.
The secretary sorted the letters into different envelopes.