Definition of retortion in English:

retortion

noun

  • [mass noun] (in international law) retaliation by a state on another's subjects.

    • ‘A 1447 toll on the Prussian towns' vessels was rather in the nature of retortion than the pursuit of a consistent policy.’
    • ‘It followed that retortion could not always be regarded as a legitimate action from the standpoint of international law.’

Origin

Late 16th century (in the sense ‘bending or turning backwards’): from retort, perhaps on the pattern of contortion.

Pronunciation:

retortion

/rɪˈtɔːʃ(ə)n/