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- DictionarySpace-time/ˌspāsˈtīm/
noun
- 1. the concepts of time and three-dimensional space regarded as fused in a four-dimensional continuum: "the curvature of space-time"
noun
Mathematical model combining space and time
In physics, spacetime is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects such as how different observers perceive where and when events occur. Wikipedia