principium

noun
prin·​cip·​i·​um | \prin-ˈsi-pē-əm, prin-ˈki-\
plural principia\ prin-​ˈsi-​pē-​ə , prin-​ˈki-​ \

Definition of principium 

: a fundamental principle

First Known Use of principium

1550, in the meaning defined above

History and Etymology for principium

Latin, beginning, basis

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The first known use of principium was in 1550

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