Englishfor English speakers
functional
Adjective
—
If something is functional, it is working properly or normally.
The flashlight was still functional after I dropped it down the stairs.
density
Noun
—
Density is how much stuff fits in a particular area.
The population density of Singapore is one of the highest in the world.
—
The density of a material is how closely packed its atoms are.
The density of water is higher than the density of steam.