"Measure of the same" From Newtons Principia: "THE QUANTITY OF MATTER IS THE MEASURE OF THE SAME, ARISING FROM ITS DENSITY AND BULK CONJUNCTLY." What does he mean when he says "is the measure of the same"? This phrase is used many times in his other definitions as well: "THE QUANTITY OF MOTION IS THE MEASURE OF THE SAME, ARISING FROM THE VELOCITY AND QUANTITY OF MATTER CONJUNCTLY." Or; "THE ACCELERATIVE QUANTITY OF A CENTRIPETAL FORCE IS THE MEASURE OF THE SAME, PROPORTIONAL TO THE VELOCITY WHICH IT GENERATES IN A GIVEN TIME." English is not my first language, perhaps the reason to my confusion.