the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
a special camera that takes photographs of cars that are travelling faster than the legal speed limit. The photographs are used as proof that drivers have broken the law.
an event at which you meet and talk to a lot of different people for only a few minutes at at a time. People do this in order to try to meet someone and have a romantic relationship.