noun, plural prin·cip·i·a [prin-sip-ee-uh] /prɪnˈsɪp i ə/.
Examples from the Web for principia
It is more fully explained by him, with later simplifications, in Principia mathematica (Cambridge).
They are the principia of the science—they are the sauces which Soyer daily and principally uses.The Gastronomic Regenerator:|Alexis Soyer
After formally winding up the whole enquiry, he proceeds to ask regarding the principia of Demonstrative Science: What are they?
Dum moraretur Parisiis, principia scientiae naturalis investigare coepit.Brief Lives (Vol. 1 of 2)|John Aubrey
Aristotle next proceeds to refute, at some length, the supposition, that the principia of all syllogisms are the same.