This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The way I'd expect the terminology to be used: for an instance variable, there's one variable belonging to each instance of the class. For a class variable, there's a single variable belonging to the class. In Java that corresponds to the variable being declared static.