| Noun | 1. | Decatur - United States naval officer remembered for his heroid deeds (1779-1820) | |
| 2. | Decatur - a city in central Illinois; Abraham Lincoln practiced law herecity, metropolis, urban center - a large and densely populated urban area; may include several independent administrative districts; "Ancient Troy was a great city" | |
| 3. | Decatur - a town in northern Alabama on the Tennessee Rivertown - an urban area with a fixed boundary that is smaller than a city; "they drive through town on their way to work" | |