The meaning of the Acronym POSSE is...

POSSE is

• Peers Organized to Support Student Excellence

More Meanings For POSSE:

• Peers Organized to Support Student Excellence
• Pluto And Outer Solar System Explorer
• Preserve Our Student Shows For Eternity
• Party Of Sixth Seventh And Eighth

POSSE is also in:

• Educational
• Law
• NASA
• Universities