A distinct division within a process model or product life cycle, typically a fundamental transition in the development of a product or service, culminating in a major or external milestone, or representing a fundamental transition in the development of a product or service.
— Computer ScienceIn planning, a definitive stage of a campaign or operation during which a large portion of the forces and capabilities are involved in similar or mutually supporting activities for a common purpose.
— USA ArmyThat phase of military supply that extends from determination of procurement
— USA Army