Made, done, or happening without method or conscious decision. The teacher called on a random student to answer the question.
Chosen without a particular plan or pattern. We picked a random number to determine the winner of the raffle.
Lacking a definite plan, purpose, or pattern. His random comments during the meeting confused everyone.
Informal: Unusual, unexpected, or strangely out of context; odd or quirky. That was a really random comment to make during the meeting.
Mathematics & Statistics: Relating to a process or outcome in which each possible value is equally likely to occur; governed by chance. In a random sample, every member of the population has an equal probability of being chosen.