speed
noun
1 rapidity of movement or action : the accident was due to excessive speed | figurative they were bemused by the speed of events.
• the rate at which someone or something is able to move or operate : the car has a top speed of 147 mph.
• each of the possible gear ratios of a bicycle or motor vehicle.
• the sensitivity of photographic film to light.
• the light-gathering power or f-number of a camera lens.
• the duration of a photographic exposure.
2 informal an amphetamine drug, esp. methamphetamine.
3 informal something that matches one's tastes or inclinations : oak tables and chairs are more his speed.
4 archaic success; prosperity : wish me good speed.