vi to serve in a campaign.
2. campaign ·noun political operations preceding an election; a canvass.
3. campaign ·noun the period during which a blast furnace is continuously in operation.
4. campaign ·noun an open field; a large, open plain without considerable hills. seechampaign.
5. campaign ·noun a connected series of military operations forming a distinct stage in a war; the time during which an army keeps the field.