| 1. | Military.
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| 2. | a systematic course of aggressive activities for some specific purpose: a sales campaign. |
| 3. | the competition by rival political candidates and organizations for public office. |
| 4. | to serve in or go on a campaign: He planned to campaign for the candidate. He campaigned in France. |
| 5. | to race (a horse, boat, car, etc.) in a number or series of competitions. |