The meaning of the Acronym SDN is...

SDN is

• Shopaholics Daily Nightmare
• Subjects Distinguished Name
• Shareware Distribution Network
• Savage Daily News
• Steep Deep And Narrow

More Meanings For SDN:

• Software Distribution Network compressed file archive
• Send Data Now
• Send Data Now
• Software Defined Network
• Student Doctor Network
• Shopaholics Daily Nightmare
• Subjects Distinguished Name
• Shareware Distribution Network
• Savage Daily News
• Steep Deep And Narrow
• Specially Designated National
• Screening Deficiency Notice (Canada)
• System Development Notification
• Service Drawing Number
• Send Data Now

SDN is also in:

• FDA
• File Extensions
• Hardware
• International Business
• Military
• Networking
• Telecom
• Unfiled
• Universities