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.
A car speedometer that indicates measured speed in kilometres per hour. Automobile speedometer, indicating speed in miles per hour (MPH) on the outer scale and kilometres per hour on the inner scale. In Canada it is the outer scale that is indicated in km/h and the inner scale in MPH, if the latter appears at all.