Printable-file extension

• E-book format, often
• PC file that's shareable
• File shareable on a PC or Mac
• Many an emailed document
• Common attached file
• File format created by Adobe
• Email attachment, briefly
• Office export, often
• Acrobat's document

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