Classes of phenomena are not real things, they are collections of happenings which human beings have grouped together. Definition 3 might also give us the wrong idea that electric current is a flow of energy. It is not. When charges flow, energy does not flow along with them. There is actually just one form of electrical energy.
Electromagnetic energy is light waves, radio waves, magnetic fields, and electric fields.
Static electricity and current electricity are not made of electromagnetic fields, therefor they are not a form of energy. However, Definition 3 can be found in dictionaries. This suggests that, even though it is wrong, definition 3 is real. Don't forget that dictionaries also contain slang words. Dictionaries record which words we commonly use, even we use those words incorrectly, or even if we assign several contradictory meanings to the words.