The word electricity derives from New Latin and ultimately Greek. It first appears in English in Francis Bacon's writings. Depending on context, the word may refer to "electric charge", "electric power" or "electric energy". Historical drift Pre-English origins The New Latin adjective , originally meaning 'of amber', was first used to refer to amber's attractive properties by William Gilbert in his 1600 text De Magnete. The term came from the classical Latin , 'amber', from the Greek (), 'amber'. The origin of the Greek word is unknown, but there is speculation that it might have come from a Phoenician word , meaning 'shining light'. Entry into English The word electric was first used by Francis Bacon to describe materials like amber that attracted other objects. The first usage of the English word electricity is ascribed to Sir Thomas Browne in his 1646 work, Pseudodoxia Epidemica: In this context, an "Electrick" or "Electrick body" was a non-conductor, or an object capable of attracting "light bodies" (like bits of paper) when excited by friction; a piece of amber is "an Electrick", while a piece of iron is not. "Electricity", then, was simply the property of behaving like an electric, in the same way that "elasticity" is the property of behaving like an elastic. ("Electric" continued to be used as a noun until at least 1913 and is still used in this sense in the word "dielectric".) It was not until later that the definition shifted to refer to the cause of the attraction instead of the property of being attractive. Charge, in the electrical sense, was first used in 1748. "Quantity of electricity" The term quantity of electricity was once common in scientific publications. It appears frequently in the writings of Franklin, Faraday, Maxwell, Millikan, and J. J. Thomson, and was even occasionally used by Einstein. However, over the last hundred years the term electricity has been used by electric utility companies and the general public in a non-scientific way. Today the vast majority of publications no longer refer to electricity as meaning electric charge. Instead they speak of electricity as electromagnetic energy. The definition has drifted even further, and many authors now use the word electricity to mean electric current (amperes), energy flow (watts), electrical potential (volts), or electric force. Others refer to any electrical phenomena as kinds of electricity. These multiple definitions are probably the reason that quantity of electricity