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Pronunciation change

Noun change

Singular
envelope

Plural
envelopes

 
An envelope
  1. An envelope is a paper cover that you put a letter in to send it.
    She put the letter into the envelope, addressed it to Charles, and put a stamp on it.
  2. An envelope is a covering that goes all the way around something.
    Each virus has a special envelope of protein surrounding it.

See also change