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| abstraction > mathematical concept > number > quantity > time > crossing time | 
| crossing time comparison table | |||
| Subject | is an instance of | is a kind of | has definition | 
|---|---|---|---|
| time | quantity | A dimension distinguishing past, present, and future. In relativity, time is portrayed as a geometrical dimension, analogous to the dimensions of space. | |
| crossing time | time | The time it takes a particle to travel from one point in its orbit to another point 180° away. | 
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