1. an area that is surrounded by a fence, wall, or other barrier
2. something that is included with a letter or package
3. the act of surrounding or closing off an area

Examples

• The zoo built a new enclosure for the elephants.
• Please find the contract as an enclosure with this letter.
• The dog ran freely within the fenced enclosure.
• The document was sent as an enclosure to the main report.
• They constructed a glass enclosure around the swimming pool.
• The enclosure of the common land angered local farmers.
• The bird sanctuary features a large flight enclosure.