PRAESIDIUM Meaning of PRAESIDIUM in English prae ‧ sid ‧ i ‧ um /prɪˈsɪdiəm, -ˈzɪ-/ BrE AmE noun [countable] another spelling of ↑ presidium Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012