Mathematics Terminology

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Whole Numbers

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The numbers in the following never-ending sequence: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, ...

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x-axis

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The horizontal axis of a coordinate plane.

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x-intercept

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The point of intersection of a graph with the x-axis.

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y-axis

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The vertical axis of a coordinate plane.

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y-intercept

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The point of intersection of a graph with the y-axis.

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Absolute Value

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A number’s distance from zero. For any x, it is defined as: |x| = -x, if x < 0; x, if x ≥ 0.

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Acute Angle

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An angle whose measure is greater than 0 and less than 90 degrees.

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Acute Triangle

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A triangle in which all three angles are acute.

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Algebraic Expression

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An expression that includes one or more variables and may also include symbols indicating an operation or a relationship.

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Coefficient

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In the product of a constant and a variable, the constant is the numerical coefficient of the variable and is often referred to simply as the coefficient.