(photography) The duration of time for which the shutter of a camera remains open when exposing photographic film or other photosensitive material to light for the purpose of recording an image.

A device that limits vehicle speed.

(computing) The rate, measured in hertz, at which a processor performs its fundamental operations.

plural of speed freak

(physics) The velocity equal to one Planck length per Planck time; equal to the speed of light. Symbol is v_P or c.

That operates, moves or takes place at less than normal speed.

(informal) Anything that is extremely fast and reckless.

speed bump

A section of a roadway where speeds of vehicles are monitored by authorities.

A function on some telephones allowing a phone number to be dialed by pressing only one or two keys.