The meaning of the Acronym SAD is...

SAD is

• Socrates Action Day
• Single Awareness Day
• Swallow Arrival Day

More Meanings For SAD:

• Systems Analysis and Design
• Strategic Accelerator Design
• Smart Ack Dropper
• Security Association Database
• Single, Available, and Desperate
• Supply Air Duct
• School of Architecture and Design
• Selected Area Diffraction
• Silicon Avalanche Diode
• Scientifically Aided Design
• System Analysis and Design
• Sum of Absolute Differences
• Students Affairs Department
• Sexy Angelic Diva
• Sexy And Delicious

SAD is also in:

• Adults
• Architecture
• Assembly
• Chat
• Electronics
• General
• Mathematics
• Networking
• Security
• Universities