Sentence:  We may express all these results in a concise and consistent manner by describing an electrified body as "charged" with a certain "quantity of <WSD>electricity</WSD>", which we may denote by "e". 
Meaning of the word marked with <WSD> tags:  Originally, a property of amber and certain other nonconducting substances to attract lightweight material when rubbed, or the cause of this property; now understood to be a phenomenon caused by the distribution and movement of charged subatomic particles and their interaction with the electromagnetic field. (from 17th c.)