Final answer:
The term for a timeboxed cycle of development that includes all necessary work to deliver value is called a Sprint, part of the Scrum Agile methodology.
Step-by-step explanation:
The term for a timeboxed cycle of development focused on a product or deliverable, where all necessary work to deliver value is completed, is known as a Sprint. A Sprint is a component of the Agile methodology called Scrum, which is known for its iterative and incremental approach to software development and project management. The engineering design process in such a context is cyclical and repetitive, with each cycle, or Sprint, aiming to produce a potentially shippable product increment.