functionalfunc·tion·al /ˈfʌŋkʃənəl/ adjectiveadj [only before a noun]1connected with the purpose for which something is made or used, or with the job that someone doesThree key functional areas of management are marketing, production and personnel management.
The project manager is responsible for ensuring that time and money are properly budgeted between functional departments.
2designed to be useful rather than beautiful or decorativeWe now have premises which are both smart and functional.
3working in a way that something is supposed toIntel is sending fully functional samples of the chips for shipment to manufacturers.
—functionally adverbadvtools that are labour-saving and functionally efficient