1.Going at random or by chance; done or made at hazard, or without settled direction, aim, or purpose; hazarded without previous calculation; left to chance; haphazard; as, a random guess. "Some random truths he can impart." "So sharp a spur to the lazy, and so strong a bridle to the random."
2.(Statistics) Of, pertaining to, or resulting from a process of selection from a starting set of items, in which the probability of selecting any one object in the starting set is equal to the probability of selecting any other.
3.(Construction) Of unequal size or shape; made from components of unequal size or shape.