Definition--lacking a definite plan, system or order; haphazard; irregular.
Discussion--The term "random" is an old word that American pop culture has recently made fashionable. Young people today commonly use the word "random" in reference to certain disordered, unpredictable or seemingly nonsensical events in their everyday lives.
However, use of the word "random" is not confined the the young and hip. It is a term that has long been used in such fields as statistics, where it refers to calculations of probability.
Etymology--The term random was originally derived from the Old French word randum, meaning rush or disorder. Randum comes from the Old French word randir, which means to run fast. From these roots came the Middle English randun, meaning impetuosity or speed.