Definitions

1. verb

to cut off the head of someone or something, especially as a punishment or in a violent or brutal manner

“The executioner was instructed to decapitate the convicted felon.”

2. verb

to remove the head of something, such as a plant, in order to kill it or prevent it from growing

“The gardener decided to decapitate the dead flower to promote new growth.”

3. noun

the act of cutting off the head of someone or something

“The decapitation of the king led to a power struggle among the nobles.”