Englishfor English speakers
Ac
—
noun
(= actinium)
a radioactive element of the actinide series; found in uranium ores
AC
—
noun
an electric current that reverses direction sinusoidally
In the US most household current is AC at 60 cycles per second
servo
—
noun
control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system
—
adjective
(= servomechanical)
of or involving servomechanisms
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.