'Describes a task definition.
:type task_definition: string
:param task_definition: The `family` and `revision` (
`family:revision`) or full Amazon Resource Name (ARN) of the task
definition that you want to describe.'

def describe_task_definition(self, task_definition):

    params = {'taskDefinition': task_definition}
    return self._make_request(action='DescribeTaskDefinition', verb='POST', path='/', params=params)
