# randomness

/ˈɹændəmnəs/ (US) · /ɹˈændəmnəs/ (UK) · CEFR B2 · Noun

Source: https://englishreference.com/word/randomness
Updated: 2026-05-19

## Definition

the quality of being without any pattern or order. You use this to describe things that happen by chance rather than by a plan.

For teachers: the quality of being without any pattern, plan, or predictability. Often used to describe the lack of correlation between events or the absence of a systematic cause.

## Examples

- The lottery is based on pure randomness.
- The scientist noticed that the data showed no randomness and suggested a hidden pattern might be at work.
- In probability theory, the concept of randomness is essential for defining events that cannot be predicted with certainty, even if all initial conditions are known.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.