Short form of random — without predictable pattern. A named abbreviation rather than a concept.
Clipped from random, itself from Old French randon (rush, disorderly haste, force), from randir (to run fast), of Germanic origin; rand keeps the shortened letters and leaves the sense of haphazard motion behind in the word it stands for.
Short form of random — without predictable pattern. A named abbreviation rather than a concept, standing in for a word whose own history was once simply about running fast and out of control.