The following web sites may help you in your

How Airplanes Fly
Look for your definitions here:

Aeronautics Vocabulary

Your Own Flight: Forces of Flight

Great site about the history of flight and explains the four forces of flight.
How Airplanes Work

Simple to very technical explanations
Principles of Aeronautics

Terrific site, with history, myths, sports and more.
What is Aeronautics?


Experiment! Change the angle of attack, thrust, and elevator and see how far you can throw a paper airplane in this neat simulator.
Flight Simulator:

Flight Simulator 2:


Other Interesting Sites:
Merriam-Webster's Collegiate Dictionary

NASA's Beginners Guide to Aerodynamics

Directions for Paper Airplanes

Ken Blackburn's Page