noun. ['ˌpɝːtɝˈbeɪʃən'] an unhappy and worried mental state.
noun. ['ˌpɝːtɝˈbeɪʃən'] activity that is a malfunction, intrusion, or interruption.
noun. ['ˌpɝːtɝˈbeɪʃən'] the act of causing disorder.
noun. ['ˌpɝːtɝˈbeɪʃən'] a disposition that is confused or nervous and upset.
noun. ['ˌpɝːtɝˈbeɪʃən'] (physics) a secondary influence on a system that causes it to deviate slightly.