na-adjective
Used as an adjectival noun (na-adjective) in business, IT, and technical contexts to describe systems, processes, or capabilities that are functional and ready for use.
新しいシステムは来月からオペレーショナルになる予定です。
The new system is scheduled to become operational next month.
この機能はまだオペレーショナルでは
This feature is not yet operational, so it is in the testing phase.