What does the word distortion mean?

Usage examples for distortion

  1. Even as he raised the arm a frightful distortion seized on his face. – Man and Wife by Wilkie Collins
  2. The extended use of the milling machine, which is an especial feature of modern machine shop practice, is due, in a very large degree, to the solid emery wheel, which provides a simple method of sharpening the cutters without requiring them to be annealed and rehardened, it being found that annealing and rehardening reduces the cutting qualifications of the steel, and also impairs the truth of the cutting edges by reason of the warping or distortion that accompanies the hardening process. – Modern Machine-Shop Practice, Volumes I and II by Joshua Rose
  3. I can yet recall the individual shapes of certain hawthorn trees we passed, whose extreme age had found expression in a wild grotesqueness which would have been ridiculous but for a dim, painful resemblance to the distortion of old age in the human family. – Wilfrid Cumbermede by George MacDonald