The process of assuring that all systems and components of a major piece of equipment, a process, a building or similar are designed, installed and tested according to the operational requirements of the owner or final client.

plural of commissioning

(grammar) A grammatical mood that indicates promises or threats.

plural of commissive mood

plural of commissioned officer

(military) An officer who derives authority directly from a sovereign power and, as such, holds a commission charging them with the duties and responsibilities of a specific office or position.

(military) Not holding a military commission.

The executive branch of the European Union.

Not operational; not functioning properly.

(Christianity) The instruction of the resurrected Jesus Christ to his disciples that they spread his teachings to all the nations of the world.