Knowledge source: Abbr

• Bus.-letter abbr
• Abbr. at the end of a business letter
• Business-letter abbr
• Bus. ltr. abbr
• Abbr. with a check
• Ref. book set
• Insert: Abbr.
• Env. stuffing
• Addl. document in an envelope

Wiktionary Word definitions in Wiktionary
abbr. enclosure (qualifier indicating that a letter is accompanied by further material English)