Meaning of retorsion

re•tor•sion

Pronunciation: (ri-tôr'shun), [key]
— n. Internat. Law.
  1. retaliation or reprisal by one state identical or similar to an act by an offending state, such as high tariffs or discriminating duties.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.