Sentence:  And univerſally the <WSD>Exponent</WSD> of the "m" Power, is "m" times the <WSD>Exponent</WSD> of the Root, and the <WSD>Exponent</WSD> of the "m"-Root (or \frac{1}{m} Power) is \frac{1}{m} times the <WSD>Exponent</WSD> of the Root. 
Meaning of the word marked with <WSD> tags:  The degree to which the root of a radicand is found, for example, the 2 in \sqrt[2]r=b.