speed

The state of moving quickly or the capacity for rapid motion.

(mathematics, physics) The rate of motion or action, specifically the magnitude of the velocity; the rate distance is traversed in a given time.

(photography) The sensitivity to light of film, plates or sensor.

(photography) The duration of exposure, the time during which a camera shutter is open (shutter speed).

(photography) The largest size of the lens opening at which a lens can be used.

(photography) The ratio of the focal length to the diameter of a photographic objective.

(slang, uncountable) Amphetamine or any amphetamine-based drug (especially methamphetamine) used as a stimulant, especially illegally.

(archaic) Luck, success, prosperity.

(slang) Personal preference.

(finance, uncountable) A third-order measure of derivative price sensitivity, expressed as the rate of change of gamma with respect to changes in the underlying asset price.