The Swedish word for key is
nyckel

Translations for key and their definitions

nyckel	©
1. n-c. key

tangent
1. n-c. key (button on a typewriter, computer keyboard or piano)
2. n-c. (mathematics) tangent

knapp	©
1. adj. scarce, not much of something
tiden är knapp
there's not much time
växa upp under knappa omständigheter
to grow up under conditions where nothing is abundant
2. adj. somewhat less than
en knapp kilometer
somewhat less than one kilometre
3. n-c. button
4. n-c. knob, lever, switch (e.g. the button for an electrical on/off switch)
5. n-c. (botany) anther