What does the word contraction mean?

Usage examples for contraction

  1. Let us suppose that by contraction of the sphere it had diminished to one- half its diameter; and let us fix our attention on a cubic inch of the gaseous matter in any point of the mass. – The Story of the Heavens by Robert Stawell Ball
  2. A more important fact is that, as far as I know, extreme contraction of the pupils is not a symptom of sleeping sickness. – The Mystery of 31 New Inn by R. Austin Freeman
  3. The frown on the brow and the contraction of the features, just then, surely did not come from pain. – Barren Honour: A Novel by George A. Lawrence