prin·cip·i·um | \ prin-ˈsi-pē-əm 
, prin-ˈki- \
, prin-ˈki- \ plural principia\ prin-ˈsi-pē-ə , prin-ˈki- \
, prin-ˈki- \Definition of principium
: a fundamental principle
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The first known use of principium was in 1550
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