random number
B2Neutral to Technical
Definition
Meaning
A number selected from a specified set of possible values where each value has an equal probability of being chosen, typically generated by a process that lacks any pattern or predictability.
In a broader or informal context, any seemingly arbitrary or haphazard number, often used metaphorically to describe something chosen without a clear system or reason.
Linguistics
Semantic Notes
The term has a strict technical meaning in mathematics, statistics, and computing (a value from a probability distribution). In everyday use, it's often looser, implying 'any arbitrary number'. The phrase is a compound noun, typically treated as singular, but can be pluralised (random numbers).
Dialectal Variation
British vs American Usage
Differences
No significant differences in definition or core usage. Minor variations in associated technical jargon (e.g., 'pseudorandom' vs 'pseudo-random' hyphenation).
Connotations
Identical. Associated with concepts of chance, unpredictability, and computational processes in both varieties.
Frequency
Similar high frequency in technical domains. Slightly more frequent in American English corpus data due to the larger tech industry discourse.
Vocabulary
Collocations
Grammar
Valency Patterns
VERB + random number (generate, pick, select, choose)ADJ + random number (pseudo-, truly, cryptographic, uniform)random number + NOUN (generator, sequence)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “It's just a random number. (implying insignificance or arbitrariness)”
- “Picked out of a hat (related concept for selection)”
Usage
Context Usage
Business
Used in simulations, modelling risk, or A/B testing (e.g., 'The model was run with 10,000 random numbers to simulate market volatility.').
Academic
Core concept in statistics, probability theory, and computational methods (e.g., 'The sample was selected using a table of random numbers.').
Everyday
Used in games, draws, or casual decisions (e.g., 'Think of a random number between one and twenty.').
Technical
Fundamental in cryptography, computer science algorithms, and statistical sampling (e.g., 'The encryption key is derived from a cryptographically secure random number.')
Examples
By Part of Speech
verb
British English
- The programme is designed to randomise the numbers.
- We need to randomly number the participants.
American English
- The program is designed to randomize the numbers.
- We need to randomly number the participants.
adverb
British English
- The items were arranged randomly, not sequentially.
- Numbers were assigned randomly to the test groups.
American English
- The items were arranged randomly, not sequentially.
- Numbers were assigned randomly to the test groups.
adjective
British English
- The random-number selection process was audited.
- She used a random number table.
American English
- The random-number selection process was audited.
- She used a random number table.
Examples
By CEFR Level
- I chose a random number for the game.
- The teacher asked for a random number from one to ten.
- The lottery machine generates a random number every week.
- Please select a random number from this list.
- For the experiment, each participant was assigned a random number to ensure anonymity.
- The algorithm's security depends on a highly unpredictable random number.
- Critics argued that the pseudo-random number generator exhibited subtle biases after billions of iterations.
- Quantum phenomena are often harnessed to produce truly random numbers for cryptographic applications.
Learning
Memory Aids
Mnemonic
Imagine a RANDOM NOMAD (sounds like 'number') wandering without a plan, picking numbers from a desert of digits with no pattern to his journey.
Conceptual Metaphor
UNPREDICTABILITY IS RANDOMNESS (e.g., 'His mood was like a random number.'), FAIRNESS/IMPARTIALITY IS RANDOM SELECTION (e.g., 'Using random numbers ensures a fair draw.')
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as 'случайное количество' (which means 'random amount/quantity'). The correct equivalent is 'случайное число'.
- The phrase 'random number generator' is a fixed term: 'генератор случайных чисел' (GSC).
Common Mistakes
- Using 'random number' as an adjective without a hyphen (e.g., 'a random number generation' should be 'a random-number generation' or 'the generation of random numbers').
- Confusing 'random number' (the value) with 'random number generator' (the process or device).
Practice
Quiz
In a strict statistical context, what is a defining characteristic of a 'random number'?
FAQ
Frequently Asked Questions
Yes. A 'random number' (or 'truly random') comes from a physical, unpredictable source (e.g., atmospheric noise). A 'pseudo-random number' is generated by a deterministic algorithm but is designed to statistically resemble true randomness for practical purposes.
Yes. 'Random numbers' refers to a sequence or set of such values, e.g., 'a list of random numbers'.
In everyday talk, it often means 'any arbitrary number'. Technically, it implies a specific, well-defined statistical property and method of generation.
Using it to mean 'random amount' (e.g., 'a random number of people'). While understood, it conflates 'number' (a numeral) with 'quantity'. Better: 'a random number' (e.g., 7) vs. 'a random number of' (e.g., several).