Word: Envelope

Pronunciation

/ˈenvəlopeɪ/

Definitions

• Noun: A flat paper container, often with a gummed flap, used for enclosing and sending letters or documents through the mail or for storing papers together. For example: “She sealed the letter in an envelope and put it in the mailbox.”
  • Also used metaphorically to denote something that surrounds, encompasses, or contains another thing; like the atmosphere as the envelope of the Earth.
  • In mathematics or physics, it can refer to a boundary or surface that encloses a volume, such as a light cone in spacetime.

Example sentence (noun):

• He slipped the important document inside a yellow envelope before sealing it.

• Verb: To wrap up or cover completely with or as if with an envelope. For example: “The virus envelopes its host cell.”

  • Also used figuratively to mean to enclose or contain something within a defined space or limit.

Example sentence (verb):

• The new building design envelopes a central courtyard.

Phrases

• “Push the envelope” meaning to exceed normal limits or boundaries, typically in reference to technological or creative endeavors.
• “Envelope budgeting” is a financial planning method where income is allocated to various expenses categories represented by separate envelopes.

Example Sentences

• Noun: “I need to buy some stamps to mail these envelopes.”
• Verb: “The darkness began to envelope the city as the sun set behind the horizon.”

Synonyms

• Wrapper
• Cover
• Packet
• Sleeve
• Enclosure
• Case (metaphorical uses)
• Sheath (for metaphorical enveloping)
• Coating (in scientific contexts)