| Collis | United States railroad executive who built the western section of the first United States transcontinental railroad (1821-1900) |
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| Collis | a conflict of opposed ideas or attitudes or goals |
| Collis | an accident resulting from violent impact of a moving object |
| Collis | (physics) an brief event in which two or more bodies come together |
| Collis | a course of action (following a given philosophy) that will lead to conflict if it continues unabated |
| Collis | a course of a moving object that will lead to a collision if it continues unchanged |