OH Geeze. Yea, as the son of an electrical "ENGINEER". Suffice to say this, despite "Websters" lack of forthought on the subject. Here goes, and let the flaming toward me begin:
First: An engine converts potential energy into kinetic energy. Remember simple High school physics. For those who are looking to nitpick with me: I will define potential energy in the form of solid, liquid or gaseous fuel that must chemically be altered to release energy.
Potential energy may be stored in the form of battery packs which utilize chemical change; capacitors which store electrical charge; tanks which store pressurized air. However, when it is released, it becomes kinetic energy.
A motor then, harnesses kinetic energy to perform work: IE move something, turn a wheel, push a lever, heat or cool something. An exhaust turbocharger is by definition, a motor. It utilizes flowing gases to spins a set of turbines to increase airflow into the "engine", where a chemical process takes place resulting in motion. Your wiper mechanism utilizes released air to change kinetic energy to work. Electricity, admittedly caused by a chemical reaction in a battery, is directed/admitted into a mechanism to perform work. Hence electric MOTOR.
What about "Steam engines" of the late 19th and early 20th Centuries? Why weren't they called steam "motors"? Well, our forfathers had the sense enough to look at the totality of the machine. They converted coal or wood (potential energy) into heat and steam(Kinetic energy), that in and of itself does not define anything, and when connected to a machine that changed kinetic energy to work, and packaged as one unit, effectively became an "Engine".
So yes, if you looked at your battery powered "Walkman" CD player (if people still use them) as a unit in it entirety; Chemical energy converted to electrical energy converted to spinning wheel(work), I suppose you could call it an engine, and I couldn't argue with you. although the specific part that converts the electricity into motion is in fact: A motor.
Having typed all that: I just spoke with my Dad. He said "Well, you wouldn't hear the term "electric engine" being used, but you will hear "gas motor". It's just the way people speak. Stick with convention. People know you are talking about the Prime mover."
Maybe we should "motor" back to topic? Enough flaming of the guy. If you insist on playing childish games; flame me instead. I've just given you more than enough "fuel" to play with.
And to think I just posted about how wonderful and helpful and well thought you guys were. Richard, I hope you are up there watching all this. By the way, I can't find the recent post of who has his Eagle. Anyone wanna chime in?
You bet Len,we even passed 3 motor cycles on the way home,or was that engine cycles?