envelope

noun
UK: /ˈenvələʊp/
US: /ˈenvəloʊp/

  1. A flat paper container used to send a letter.

    1. I put the letter in an envelope. [ ] [ ]
    2. She sealed the envelope and put a stamp on the upper right corner. [ ] [ ]

  2. A surrounding or covering; something that encloses.

    1. A thick envelope of fog surrounded the house [ ] [ ]
    2. The protective envelope of the Earth's atmosphere sustains life. [ ] [ ]

  3. In geometry, a curve or surface that is tangent to each of a family of curves or surfaces.

    1. The software calculated the envelope of possible antenna configurations. [ ] [ ]
    2. The design team focused on understanding the performance envelope of the wing. [ ] [ ]

Synonyms

sheath case surround covering wrapper
envelope verb

  1. To completely surround or cover something.

    1. Darkness enveloped the town. [ ] [ ]
    2. A sense of peace enveloped her as she walked in the forest. [ ] [ ]

Frequently Asked Questions

The word "envelope" in English means: A flat paper container used to send a letter., A surrounding or covering; something that encloses., In geometry, a curve or surface that is tangent to each of a family of curves or surfaces..

The phonetic transcription of "envelope" is /ˈenvələʊp/ in British English and /ˈenvəloʊp/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "envelope": sheath, case, surround, covering, wrapper.

Example usage of "envelope": "I put the letter in an envelope.". More examples on the page.