B2noun1K

Envelope

UK /["/ˈenvələʊp//ˈɒnvələʊp/"]/US /["/ˈenvələʊp//ˈɑːnvələʊp/"]/

Definition

a flat paper container used for sending letters in, with a part that you stick down to close it

In simple words: A flat, usually rectangular container for letters or documents.

Examples

  • She carefully placed the letter inside the envelope before mailing it.
  • The envelope was sealed tightly to protect the confidential documents.
  • In biology, the virus has an outer envelope that protects its genetic material.
  • Astronomers study the sun's envelope to understand solar storms better.
  • He sent an envelope containing the invitation to all his friends.
  • The theater's seating capacity was increased to accommodate a larger envelope of guests.
  • The pilot adjusted the aircraft's envelope to ensure safe flying conditions.

Usage notes

Use 'envelope' when referring to the paper container for letters. It's common in both spoken and written English. Avoid using it in technical contexts unrelated to mailing.

Grammar pattern

standalone noun

Memory hint

Think of 'envelope' as 'in-velope' — it holds a letter inside.

Collocations

  • bulky
  • fat
  • thick
  • open
  • rip open
  • slit open
  • contain something
  • enclose something
  • in an/​the envelope
  • into an/​the envelope
  • on an/​the envelope
  • the back of an envelope

Synonyms

  • packet
  • wrapper
  • cover

Antonyms

  • uncovering
  • opening

Common mistakes

  • Confused with 'envelop' which means to surround.
  • Using 'envelope' as a verb mistakenly.
  • Mispronouncing it as 'envelop' instead of 'en-vel-ope'.