Commercially. Pertaining to the nature of trade; the making of money. Complicated. Not easily explainable; not easy to separate. Comparatively. Judged by something else; taken with reference to another object or thing. Compression. The drawing together; forcing into a smaller compass, or space. Composition. Made up of different elements, or things. Conceivable. Made up from the imagination. Concaved. Hollowed: In aviation it has reference to the underside of the plane, which is usually provided, structurally, with a hollow or trough formation. Conforming. To make alike in form; to bring into harmony. Conjunction. In eonneetion with; joining together. Convex. A rounded surface; a bulging out. Conclusion. The end; a finding in law; a reasoning from a certain condition. Conductivity. The property of materials whereby they will transmit heat along from one part to another, also electricity. Concentrated. Brought together; assembled in a smaller space. Conclusive. A positive ending; decisive of the matter at issue. Concentrically. A line which is at all points at the same distance from one point. Condensation. The act or process of making denser, or being brought together. Contemplate. To consider; to judge. Convoys. A protecting force which aeeompanies the transfer of property. Convection. The diffusion of heat through a liquid or gas. Consistent. A state of harmony; the same at &11 times. Constant. In mathematics, a figure which never changes; or a figure used as a fixed valuation in a problem. Controllable. Held within bounds; that which can be within the power to accomplish. Correctional. The means whereby a fault may be made right. Consequence. The result; that which flows from a preceding action. Counterforce. An action contrary or opposite to the main force. Counter-balance. Any power equally opposing another. Counteract. A force acting in opposition to another. Countercurrent. An air current which sets up in an opposite direction in the path of a moving aeroplane. Cushioned. An action which takes place against a moving aeroplane, by a sudden gust of air or countercurrent. Dedicated. To set apart for some special purpose. Degree. An interval; a grade; a stage; a certain proportion. Deltoid. Shaped like the Greek letter delta. Density. Closeness of parts. Demonstration. Making clear; showing up; an exhibition or expression. Deceptive. The power or tendency to give a false impression. Deterrent. To hold back; to prevent action. Detracting. The tendency to take away; to belittle. Depressed. To move downwardly. Destination. The place set for the end of the journey. Despoiling. To take away from; robbing or taking from another by force or by stealth. Dependant. Hanging below; projecting from the lower side. Dexterity. Agility; smartness in action. Deranged. Put out of order; wrongly arranged. Develop. Brought out; to put into a correct shape or form. Deferred. Put over to another time.