What does random mean?
“Random” describes something that happens or is chosen without a fixed, deliberate, or predictable pattern. In everyday use, it often suggests that an event is accidental, haphazard, or arbitrary: a random noise interrupted the conversation, or the prize was awarded to a random participant. In research and statistics, however, “random” has a more precise meaning. A random sample is deliberately constructed so that every member of the relevant population has a known or equal opportunity of selection, helping researchers reduce bias and make results more representative. The adverb “randomly” describes performing an action in an unsystematic or chance-based way, while the informal noun “a random” means an unspecified person or thing. Because the word can describe both uncontrolled outcomes and carefully designed chance procedures, it is especially useful for distinguishing genuine arbitrariness from a deliberate effort to eliminate favoritism.
Occurring or chosen without a deliberate pattern or method, often as a result of chance; arbitrary or unsystematic.
"The researchers used a random sample to represent the wider population."
In statistical contexts, “random” may describe a deliberately designed process that ensures unpredictability or equal selection probability.
In a random, unsystematic, or chance-based manner.
"The items were placed randomly on the table."
Common in both formal descriptions of sampling procedures and informal speech.
An unspecified or randomly selected person or thing.
"The host picked a random from the crowd."
This noun use is informal; the expression “at random” is more widely accepted in formal writing.
The plural is uncommon; the informal singular “a random” is more usual.
"The team selected four randoms for the final test."
“Random” can mean the opposite of planned, but in research and statistics it can also describe a carefully designed selection process that removes bias.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does random come from?
The English word is first recorded in the Middle English period, appearing in forms such as “rand” and “randon.” Its precise origin is uncertain, and the word’s early meanings were connected with uncontrolled, abrupt, or haphazard movement. Over time, its sense broadened to include anything occurring or chosen by chance, and modern statistical usage developed a specialized sense in which randomness is deliberately designed to prevent bias.
Related word forms
How random is actually used
As an adjective, “random” usually suggests the absence of a deliberate pattern, although in statistical contexts it may describe a method designed to produce unbiased results. As an adverb, it is common in informal speech and in phrases such as “chosen at random.” The noun use, as in “a random,” is informal.