If something happens at random, it happens without regularity or predictability. It’s almost impossible to plan for a random event; you can only prepare for it.
Lightning strikes people at random.
If you play the lottery, you can have numbers picked for you at random.
The teacher called on students at random and expected them to know the answers to her questions.
There have been several random shootings in the United States recently.
The supervisor chose employees at random when deciding who would work over the weekend.
A number of mindless, random decisions made by the owner of the company lead to its closure.
How much RAM is on your computer? RAM stands for random access memory.
