| ReA | (mechanics) the equal and opposite force that is produced when any force is applied to a body |
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| ReA | (chemistry) a process in which one or more substances are changed into others |
| ReA | a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream |
| ReA | (psychiatry) a defense mechanism in which a person unconsciously develops attitudes and behavior that are the opposite of unacceptable repressed desires and impulses and serve to conceal them |
| ReA | propulsion that results from the ejection at high velocity of a mass of gas to which the vehicle reacts with an equal and opposite momentum |
| ReA | the time that elapses between a stimulus and the response to it |
| ReA | a turbine with blades arranged to develop torque from gradual decrease of steam pressure from inlet to exhaust |
| ReA | a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream |
| ReA | an extreme conservative |
| ReA | extremely conservative |
| ReA | the political orientation of reactionaries |
| ReA | extremely conservative |