Suicide (noun)

1. The act or an instance of taking one's own life voluntarily and intentionally.
2. A person who kills himself or herself.

Origin:

Late latin suicidium, from latin sui of oneself + -cidium -cide.

Examples:

1. The suicide rate is on the rise.
2. He committed suicide by jumping from the bridge.
3. The suicide note was found on the bedside table.
4. She attempted suicide but was saved in time.
5. The news of his suicide was a shock to everyone.