Definitions

1. noun

A cover or case for a letter, document, or package, typically made of paper or cardboard, with a sealable flap.

“She sealed the envelope and addressed it to her friend.”

2. verb

To surround or enclose something, typically in a protective covering.

“The company envelope its new product in a special package to attract customers.”

3. noun

A range or scope of something, such as a time period or a set of circumstances.

“The company is working within the envelope of a tight deadline to complete the project.”