depression definition. A period of drastic decline in the national economy, characterized by decreasing business activity, falling prices, and unemployment. The best known of such periods is the Great Depression, which occurred in the 1930s.
A variometer â also known as a rate of climb and descent indicator (RCDI), rate-of-climb indicator, vertical speed indicator (VSI), or vertical velocity indicator (VVI) â is one of the flight instruments in an aircraft used to inform the pilot of the rate of descent or climb.
verb. A sign shows this cars speed. A sign shows this cars speed. Speed is a way of measuring how quickly something is moving or being done, or something moving fast. 1  An example of speed is a car being driven 45 miles per hour. 2  An example of speed is someone cleaning a room in 10 minutes. 3  An example of speed is how quickly a jaguar runs.