Main Entry: 1cam·paign
Pronunciation: \(ˌ)kam-ˈpān\
Function: noun
Etymology: French campagne, probably from Italian campagna level country, campaign, from Late Latin campania level country, from Latin, the level country around Naples
Date: circa 1656
1 : a connected series of military operations forming a distinct phase of a war
2 : a connected series of operations designed to bring about a particular result <election campaign>
(businessdictionary.com)Complete, planned course of action formulated to achieve defined objectives in marketing, public relations, quality enhancement, revenue generation, safety standards, etc.
Basically a campaign is a series of connected activities to get something done; a planned course of action for some special purpose. (Admin Dictionary)