IPA: /dɪˌkæpɪˈteɪʃən/
KK: /dɪˌkæpɪˈteɪʃən/
The act of removing someone's head from their body, often as a form of execution or punishment.
The historical records show that decapitation was used as a method of execution in many cultures.
Decapitation is formed from "de-" (meaning down or away) and "caput" (meaning head). The word describes the act of removing the head, effectively taking it away from the body.
Think of 'taking away' ('de-') the 'head' ('caput') — that's why decapitation means the removal of the head.