Effective. To be efficient.
Element. One part of a whole.
Elasticity. Material which will go back to its original form after being distorted, is said to be elastic.
Eliminate. To take away from; to remove a part, or the whole.
Elliptical. Oblong with rounded ends.
Elusive. Capable of escaping from; hard to hold.
Elevator. The horizontal planes in front or rear, or in both front and rear of the supporting surfaces of an aeroplane.
Emergency. A sudden occurrence calling for immediate action.
Emplacement. A spot designed to hold heavy field pieces in intrenchments.
Enactment. The formulation of a law; the doing of a special thing.