Look at the word functional as used in the story "time capsule."
"we can take the shredder apart and reassemble it," i say.
"what? no! " dad snaps. then he sighs, and i know the exact three words he's going to say next. "michael, be realistic." (yep, i was right.)
"but—"
"first, grandpa's napping. it's hardly the time for construction. and second, it's a twenty-dollar shredder that was barely functional to begin with. there's no point fixing something that hardly works. i'll just buy a heavy-duty one tomorrow."

what does functional mean?