Definition of extenuation in US English:

extenuation

noun

  • 1The action of lessening the seriousness of guilt or an offense.

    ‘no plea could be urged in extenuation of their crime’
    count noun ‘he's always ready with extenuations and disclaimers’
  • 2literary The process of making someone or something thin.

    ‘his long wings beat slow, steady beats, as if accentuating the extenuation of the bird’

Pronunciation

extenuation

/ikˌstenyəˈwāSH(ə)n//ɪkˌstɛnjəˈweɪʃ(ə)n/