Variable
As a noun: A factor or quantity that can change or be changed. In mathematics, a symbol (usually a letter) representing an unknown or a quantity that may vary. As an adjective: Not consistent or having a fixed pattern; liable to change.
In mathematics and statistics, variables are crucial for representing unknowns or characteristics that differ among individuals or over time. They allow for generalization and modeling.
Word relationships
- factor: A factor is a general element contributing to a result; a variable is specifically a quantity that can change, often represented by a symbol in math.
- unpredictable: Unpredictable describes something that cannot be foreseen; variable describes something that changes, which may or may not be predictable.
- constant: A constant is a value that does not change, while a variable is a value that can change.
- fixed: Fixed means unchanging, whereas variable means liable to change.
Commonly confused with
- Constant: A variable is a quantity that can change, while a constant is a quantity that remains fixed throughout a particular discussion or problem.
Word family
- vary (verb): To differ in size, amount, degree, or nature from something else of the same general class.
- variation (noun): A change or difference in condition, amount, or level, typically with certain limits.
- invariable (adjective): Never changing.
Collocations
- independent variable
- dependent variable
- control variable
- random variable
- variable costs
Example sentences
- "In the equation y = 3x + 2, 'x' and 'y' are the variables, representing quantities that can change." Using it as a mathematical noun.
- "Researchers collected data on several variables, including age, income, and education level, to study their correlation." Using it as a statistical noun.
- "The weather in the mountains is highly variable, changing rapidly from sun to snow." Using it as an adjective.
Memory hook
A 'VARIABLE' is 'VARying' or changing. Vary-change
When not to use
Avoid using 'variable' when you mean a constant or a fixed value. Also, ensure the context clarifies whether you mean the mathematical term or the general adjective.
Fun facts
- The use of letters like x, y, and z to represent unknown quantities in algebra was popularized by René Descartes in the 17th century.
- In scientific experiments, identifying and controlling variables is crucial for ensuring valid results.
Related words
Our English vocabulary app: FSRS spaced repetition, 5,000+ curated words across 119 topic groups, CEFR A1 to C2. Explore your mastery with the beautiful Vocabulary World feature.