There are multiple definitions - click on the translation that matches your context.

Abmahnung

Substantiv

full

employee behavior warning letter

Comparative law notes

Germany

In the US, an employee behavior warning letter is a document that an employer issues to notify an employee that he or she violated company policy. Its purpose is notify the employee about his or her unacceptable behavior or poor performance and about the consequences of their actions. This written notice is given to an employee if they continue to violate company policies (even after receiving a verbal warning) in order to protect the company against future disputes." This form of communication is also sometimes known as a written warning, letter of reprimand, disciplinary form, and warning notice