There are several definitions of command and control (C2). According to older versions of U.S. Army FM 3-0, C2 in a military organization is the exercise of authority and direction by a properly designated commanding officer over assigned and attached forces in the accomplishment of the mission. The term may also refer to command and control systems within a military system. The 1988 NATO definition reads: Command and control is the exercise of authority and direction by a properly designated [individual] over assigned [resources] in the accomplishment of a [common goal]. The Australian Defence Force definition is similar: C2 is the system empowering designated personnel to exercise lawful authority and direction over assigned forces for the accomplishment of missions and tasks. (The Australian doctrine goes on to state: The use of agreed terminology and definitions is fundamental to any C2 system and the development of joint doctrine and procedures. The definitions in the following paragraphs have some agreement internationally, although not every potential ally will use the terms with exactly the same meaning.) Canadian defence scientists Ross Pigeau and Carol McCann discuss the issues and uncertainties related to the definition of command & control in their article in the Canadian Military Journal. The book by Vassiliou et al. contains an appendix comparing and contrasting various definitions, and also provides a useful overarching definition that subsumes most of the official ones: "'Command and Control' (C2) denotes the set of organizational and technical attributes and processes by which an enterprise marshals and employs human, physical, and information resources to solve problems and accomplish missions."

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