Englishfor English speakers
complexity
—
noun
the quality of being intricate and compounded
he enjoyed the complexity of modern computers
unit
Noun
—
One of a measure of something; the amount of something that is counted as "one".
Measure five units to the left.
$4 is the unit price.
A pound is a useful unit for thinking about amounts of butter.
—
Form of measurement.
I prefer metric units.
—
Item, used when no other word for something exists.
He set up the A/C unit.