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Dictionary
Mathematical terms explained simply.
Dictionary: Function
A function is a rule that connects each number x to exactly one number y.…
Dictionary: Variable
A variable is a symbol, usually x or y, that represents an unknown number.…
Dictionary: Coefficient
A coefficient is the number that stands in front of a variable in a mathematical expression.…
Dictionary: Constant
A constant is a number that does not change — as opposed to a variable.…
Dictionary: Slope
The slope shows how steep a straight line is — how much y changes when x increases by 1.…
Dictionary: Parabola
A parabola is the curve you get when you graph a quadratic function — the characteristic U-shape.…
Dictionary: Zero / Root
A zero (or root) is where the graph of a function crosses the x-axis — where f(x) = 0.…
Dictionary: Hypotenuse
The hypotenuse is the longest side in a right-angled triangle — the side opposite the right angle.…
Dictionary: Diameter and radius
Radius is the distance from the centre to the edge of a circle. Diameter is the distance all the way…
Dictionary: Prime number
A prime number is a natural number greater than 1 that is only divisible by 1 and itself.…
Dictionary: Absolute value
The absolute value of a number is its distance from zero on the number line — always non-negative.…
Dictionary: Fraction
A fraction is a number of the form a/b, where a is the numerator and b is the denominator (b ≠ 0).…
Dictionary: Percent
Percent means per hundred. 1% = 1/100 = 0.01.…
Dictionary: Symmetry
A figure has symmetry if it looks the same after a reflection, rotation or other transformation.…
Dictionary: Inequality
An inequality compares two expressions using , ≤ or ≥ instead of an equals sign.…
Dictionary: Mean
The mean is the sum of all values divided by the number of values — the most common measure of centr…
Dictionary: Pi (π)
Pi (π) is the ratio between the circumference and diameter of a circle — one of the most famous cons…
Dictionary: Integral
An integral is the mathematical operation that is the reverse of differentiation. It calculates the …
Dictionary: Derivative
The derivative f'(x) shows the instantaneous rate of change of a function — how quickly y changes at…
Dictionary: Vector
A vector is a quantity with both magnitude and direction — unlike a scalar which has magnitude only.…