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To remove a namespace in Kubernetes, follow these steps:

1. Open your terminal and connect to your Kubernetes cluster.
2. Run the command kubectl delete namespace <namespace name> to delete the namespace. For example, kubectl delete namespace my-namespace.
3. You can verify that the namespace has been removed by running the command kubectl get namespaces. The deleted namespace should not appear in the list.

Note: Before deleting a namespace, make sure there are no running pods, services or other resources associated with the namespace. You can use the command kubectl get pods, services, etc. --namespace <namespace name> to list all the resources in a namespace.