WordReference Random House Unabridged Dictionary of American English © 2017
ca•sus bel•li  (kāsəs belī, belē; Lat.sŏŏs bellē),USA pronunciation pl.  ca•sus bel•li 
    (kāsəs belī, belē; Lat.so̅o̅s bellē).USA pronunciation 
  1. Foreign Termsan event or political occurrence that brings about a declaration of war.
  • Neo-Latin: literally, occurrence of war
  • 1840–50

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