They worked outside, so they preferred wearing 'functional' clothes.
The building's design is not only 'functional' but also beautiful.
The flashlight was still 'functional' after I dropped it.
(..) we've got to dry-dock. What else? Some fragments caked up... and we've got to clean it all out and repressurize it. How long before we're functional? - Look, what is... What... - It's hours, tell her. - At least hours. - Yeah. Get started on the floor panel. (..)1979 Alien