The meaning of the Acronym UDF is...

UDF is

• Un- Ducted Fan aircraft engine
• Utility and Data Flow

More Meanings For UDF:

• User Defined Function
• User Defined Format
• Uniqueness Database File
• Universal Data File
• Universal Disk Format
• Filter (Photostyler)
• Uniqueness Database File (Windows NT)
• Excel User Defined Function
• Photostyler Image Filter
• Windows NT Uniqueness Database File
• Universal Disk Format
• User Defined Field
• Upper Document Feeder
• Universal Date Format
• United Dairy Farmers

UDF is also in:

• Assembly
• Databases
• Days Abbreviations
• Drivers
• File Extensions
• General
• Hardware
• Unfiled