Definition of decollation in US English:

decollation

noun

archaic
  • See decollate

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

noun

Pronunciation

decollation

/ˌdɛkəˈleɪʃ(ə)n//ˌdekəˈlāSH(ə)n/