Envelope

/ˈɛnvəlˌəʊp/

/ˈɛnvəˌɫoʊp/

Envelope

a thin, paper cover in which we put and send a letter

any wrapper or covering

the bag containing the gas in a balloon

synonyms : gasbag

the maximum operating capability of a system (especially an aircraft)

a natural covering (as by a fluid)

a curve that is tangent to each of a family of curves

Examples

1. The envelope contained a surprise birthday card.

2. She found an old envelope with photos in it.

3. She handed me an envelope with a note inside.

4. He wrote the address on the envelope.