Select the most appropriate one-word substitution for the given group of words.

The act of mercy killing in an authorized manner

Euthanasia

The most appropriate one-word substitution for "the act of mercy killing in an authorized manner" is euthanasia.

• Eurasia is a continent that includes Europe and Asia.
• Euthanasia is the act of intentionally ending a person's life to relieve suffering.
• Homicide is the killing of one human being by another.
• Suicide is the act of intentionally ending one's own life.