n]
| 1. | the act or process of deteriorating. |
| 2. | the state or condition of having deteriorated. |
| 3. | a gradual decline, as in quality, serviceability, or vigor. |

deterioration de·te·ri·o·ra·tion (dĭ-tēr'ē-ə-rā'shən)
n.
The process or condition of becoming worse.