Abandonment (noun)

1. The act of leaving something or someone permanently, especially in an abrupt or unexpected way.
2. The act of giving up control or power over something.
3. The state of being left or deserted, especially in a helpless or hopeless situation.

Origin:

From abandon + -ment, first recorded in the late 16th century.

Examples:

1. The abandonment of the project was a disappointment to everyone involved.
2. Her abandonment of the company was seen as a betrayal by many of her colleagues.
3. The abandonment of the child was a crime that shocked the community.
4. The abandonment of the old building has led to its decay and neglect.
5. The abandonment of the values that once held the society together has led to its decline.