Desertion (noun)

1. The action of deserting a place, organization, or duty, especially a military one.
2. The state of being deserted; abandonment.

Origin:

Middle english: from old french desertion, from latin desertion- "abandonment", from the verb deserere.

Examples:

1. He was charged with desertion for leaving his post during battle.
2. The soldier's desertion was a serious breach of military conduct.
3. The employee's desertion caused a major problem for the company.
4. The desertion of the fort was a major defeat for the army.
5. The desertion of the ship by its crew left it adrift.