>>371073927
Missing a few steps there. "virtus" eventually became "virtue", a term that was a more generalized reference to positive qualities instead of the specific trait of power and manliness the "virtus" meant. Eventually the term "virtually" would arise with the meaning "as far as essential qualities or facts are concerned;" around the 15th century. By the 1600s, there were recorded usages of "virtual/virtually" to mean a more familiar "in effect, as good as". From that, we derive our modern definition of "almost or nearly as described, but not completely or according to strict definition.", which has been commonly used as an adjective for various computer-related things for decades now. 

So there's not much more than a tangential connection to "power". Tbh the question sounds like some writing prompt for a high school English class.