Definitions from Wiktionary (PSO)

▸ noun:  Initialism of public safety officer.
▸ noun:  (Australia) Initialism of protective services officer.
▸ noun:  (Pakistan) Abbreviation of Pakistan State Oil.
▸ noun:  Initialism of protostellar object.
▸ noun:  Initialism of penalty shootout. [(soccer, field hockey) A series of penalties (penalty kicks in soccer), taken to decide a winner after a game has resulted in a tie and extra time has been played.]




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