Possible Definitions:
1. Campaign (n.) An open field; a large, open plain without considerable hills. SeeChampaign.
2. Campaign (n.) A connected series of military operations forming a distinct stage in a war; the time during which an army keeps the field.
3. Campaign (n.) Political operations preceding an election; a canvass.
4. Campaign (n.) The period during which a blast furnace is continuously in operation.
5. Campaign (v. i.) To serve in a campaign.
