'A way of carrying out a specific task' it says. Thus I can still argue that it is a technique, because it's the way that the power was used and thus a technique. Also, different dictionaries have different definitions. The Webster's New Encyclopedic Dictionary (©1993-2012) says, "a method of accomplishing a desired aim, ability in such treatment or use, the way in which basic physical movements are used." As such, it still works for the first one and the second one in this defintion.