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.
meter per second (m/s or m/sec) Share this item with your network: The meter per second (symbolized m/s or m/sec) is the Standard International ( SI ) unit of linear speed. This quantity can be defined in either of two senses: average or instantaneous. Average linear speed is obtained by measuring the distance in meter s that an object travels in a certain number of second s, and then dividing the distance by the time.