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Latin word principium comes from Latin -ionem, Latin princeps
-ionem (Latin)
princeps (Latin)
(military, as plural) company or division of the second line of soldiers. Author, originator, founder, head. Chief, director. Leader, first man. Prince, sovereign. Principal person Chief, distinguished. First, foremost.
principium (Latin)
(in the plural) the elements, the first principles. (military, in the plural) the front ranks, camp headquarters. A beginning, an origin. A groundwork, a foundation.