Many an emailed form

• Electronic document format
• Computer file format( Arconym )
• Sharable PC file
• File format created by Adobe
• Shareable Adobe file format: Abbr
• File type developed by Adobe
• Alternative to a Word file
• E-book format, often
• Adobe doc suffix

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
by 1992, initialism (acronym) for portable document format , a generic term.