Definition of decollation in US English:

decollation

noun

archaic
  • See decollate

    • ‘The decollation of St. Paul.’
    • ‘[He] strenuously denied the painlessness of decollation by the guillotine.’

noun

Pronunciation

decollation

/ˌdekəˈlāSH(ə)n//ˌdɛkəˈleɪʃ(ə)n/