More on Posse from Infoplease:

• poss.: meaning and definitions - poss.: Definition and Pronunciation
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• posse comitatus: meaning and definitions - posse comitatus: Definition and Pronunciation
• Posse - Posse A whole posse of men. A large number; a crowd. (See next article.) Source: Dictionary of ...
• In Posse - In Posse (Latin). What may be considered probable, but has not yet any real existence. Source: ...