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An engine is something that produces an
output effect from a given input. The origin of
engineering however, came from the design,
building and working of (military "engines")
because before such devices came to be
employed in battles there were very few
mechanical devices used. Military engines
included siege engines, large catapults,
trebuchets, battering rams etc. So the first
engineers were military engineers, then later
as engineering developed, there came civil
engineers. These were engineers who dealt
with designing, building and commissioning
roads, bridges, docks and wharves, large
public and private buildings.
An engine whose purpose is to produce
kinetic energy output from a fuel source is
called a prime mover; alternatively, a motor is
a device which produces kinetic energy from
a preprocessed "fuel" (such as electricity, a
flow of hydraulic fluid or compressed air).
A car has a starter motor, a windscreen wiper
motor, windscreen washer motor, a fuel
pump motor and motors to adjust the wing
mirrors from within the car and a (motorised)
radio antenna - but the power plant that
propels the car is an engine. Again an aircraft
will have many motors installed for operation
of its many auxiliary operations and services,
but aircraft are propelled by engines, in this
case, jet engines.