you're being too logical about it.. and about abstraction no
  less. No fun*tongue emoticon* Play a game of opposites and you
  can see how it can work: What would be a tangible abstraction?
  Art. You can touch it yet it's an abstraction. What would be an
  intangible specification (which is one of the opposites of an
  abstraction)? Or something intangibly concrete (another opposite
  of abstraction)? A good example of intangibly concrete for many
  would be logic for example. Can't touch it, but it's considered
  concrete - as in "fact". It's not as ridiculous as it at first
  seems. -- *Its not that it CAN'T be seen as a pleonasm if you
  like.* - It can and that viewpoint would not be invalid. But it
  wouldn't be complete to me, as it's stopping short of other
  options.