[ig-zur-shuh
n] 
| 1. | vigorous action or effort: physical and mental exertion. |
| 2. | an effort: a great exertion to help others. |
| 3. | exercise, as of power or faculties. |
| 4. | an instance of this. |
| ex·er·tion (ĭg-zûr'shən) n. The act or an instance of exerting, especially a strenuous effort. |