Math Dictionary

In short: Math dictionary covering 370 terms from 6th Grade through AP Calculus and AP Statistics, each explained in plain words with a short example, so students can decode a problem or review before a test.
This math dictionary explains the words you meet in textbooks, worksheets, and test directions, from 6th Grade all the way to AP courses. Every entry gives a short definition, a worked example, and pointers to related terms, so a phrase like “find the domain” or “write an equivalent ratio” never stops you cold.
Browse by grade to check the vocabulary of your own class, or by topic to see how an idea grows from one year to the next. Printed out, the pages work as a pocket reference: skim them the night before a quiz, or keep one beside a worksheet when a word in a problem is unfamiliar and you want to answer it correctly.
370 words on this page, each with a definition, a figure, a solved example and two quick questions.
Math words from A to Z
A
- AA Similarity Geometry
- Absolute Value 6th Grade
- Absolute Value Function Algebra 1
- Addition Rule of Probability Algebra 2
- Additive Inverse 7th Grade
- Adjacent Angles 7th Grade
- Algebraic Expression 6th Grade
- Alternate Interior Angles 8th Grade
- Amplitude Algebra 2
- Angle Geometry
- Angle Bisector Geometry
- Angle of Elevation and Depression Geometry
- Antiderivative AP Calculus AB
- Arc (Circle) Geometry
- Arc Length Geometry
- Area 6th Grade
- Area Between Curves AP Calculus AB
- Area of a Circle 7th Grade
- Area of a Parallelogram 6th Grade
- Area of a Sector Geometry
- Area of a Trapezoid 6th Grade
- Area of a Triangle 6th Grade
- Arithmetic Sequence Algebra 1
- Arithmetic Series Algebra 2
- Asymptote Algebra 2
- Average Rate of Change Algebra 1
- Average Value of a Function AP Calculus AB
- Axis of Symmetry Algebra 1
B
- Binomial Algebra 1
- Binomial Distribution AP Statistics
- Binomial Theorem Precalculus
- Box Plot 6th Grade
C
- Categorical and Quantitative Variables AP Statistics
- Cavalieri's Principle Geometry
- Central Angle Geometry
- Central Limit Theorem AP Statistics
- Centroid Geometry
- Chain Rule AP Calculus AB
- Change of Base Formula Algebra 2
- Chi-Square Test AP Statistics
- Chord Geometry
- Circumcenter Geometry
- Circumference 7th Grade
- Coefficient 6th Grade
- Coefficient of Determination (r²) AP Statistics
- Combination Precalculus
- Commission 7th Grade
- Complementary Angles 7th Grade
- Completing the Square Algebra 1
- Complex Conjugate Algebra 2
- Complex Fraction 7th Grade
- Complex Number Algebra 2
- Composition of Functions Algebra 2
- Compound Event 7th Grade
- Compound Inequality Algebra 1
- Compound Interest Algebra 1
- Concavity AP Calculus AB
- Conditional Probability Geometry
- Conditional Statement Geometry
- Confidence Interval AP Statistics
- Confounding Variable AP Statistics
- Congruent Figures 8th Grade
- Congruent Triangles Geometry
- Conic Sections Precalculus
- Constant of Proportionality 7th Grade
- Continuity AP Calculus AB
- Converse Geometry
- Conversion Factor 6th Grade
- Coordinate Plane 6th Grade
- Correlation Coefficient Algebra 1
- Correlation vs. Causation Algebra 1
- Corresponding Angles 8th Grade
- Cosine Geometry
- Coterminal Angles Algebra 2
- CPCTC Geometry
- Critical Point AP Calculus AB
- Cross Multiplication 7th Grade
- Cross Section 7th Grade
- Cube Root 8th Grade
D
- De Moivre's Theorem Precalculus
- Definite Integral AP Calculus AB
- Degree of a Polynomial Algebra 1
- Degrees of Freedom AP Statistics
- Dependent Variable 6th Grade
- Derivative AP Calculus AB
- Derivative Rules AP Calculus AB
- Determinant Precalculus
- Difference of Squares Algebra 1
- Differential Equation AP Calculus AB
- Dilation 8th Grade
- Discount 7th Grade
- Discriminant Algebra 1
- Disk Method AP Calculus AB
- Distance Formula 8th Grade
- Distributive Property 6th Grade
- Dividing Fractions 6th Grade
- Domain and Range Algebra 1
- Dot Plot 6th Grade
- Dot Product Precalculus
- Double Number Line 6th Grade
- Double-Angle Formulas Precalculus
E
- Elimination Method 8th Grade
- Ellipse Precalculus
- Empirical Rule (68-95-99.7) Algebra 2
- End Behavior Algebra 2
- Equation 6th Grade
- Equation of a Circle Geometry
- Equation of a Tangent Line AP Calculus AB
- Equivalent Expressions 6th Grade
- Equivalent Ratios 6th Grade
- Euler's Number (e) Algebra 2
- Expected Value Precalculus
- Experiment vs. Observational Study AP Statistics
- Experimental Probability 7th Grade
- Explicit Formula Algebra 1
- Exponent 6th Grade
- Exponent Rules 8th Grade
- Exponential Decay Algebra 1
- Exponential Equation Algebra 2
- Exponential Function Algebra 1
- Exponential Growth Algebra 1
- Exterior Angle Theorem 8th Grade
- Extraneous Solution Algebra 2
- Extreme Value Theorem AP Calculus AB
F
- Factor Theorem Algebra 2
- Factorial Precalculus
- Factoring Algebra 1
- Factoring Out the GCF Algebra 1
- First Derivative Test AP Calculus AB
- Five-Number Summary AP Statistics
- Focus and Directrix Geometry
- FOIL Method Algebra 1
- Frequency Table 6th Grade
- Function 8th Grade
- Function Notation Algebra 1
- Fundamental Theorem of Algebra Precalculus
- Fundamental Theorem of Calculus AP Calculus AB
G
- Geometric Sequence Algebra 1
- Geometric Series Algebra 2
- Greatest Common Factor (GCF) 6th Grade
H
- Histogram 6th Grade
- HL Theorem (Hypotenuse-Leg) Geometry
- Hyperbola Precalculus
- Hypotenuse 8th Grade
- Hypothesis Testing AP Statistics
I
- Imaginary Unit (i) Algebra 2
- Implicit Differentiation AP Calculus AB
- Incenter Geometry
- Independent Events Geometry
- Independent Variable 6th Grade
- Inequality 6th Grade
- Inflection Point AP Calculus AB
- Inscribed Angle Geometry
- Integer 6th Grade
- Integer Rules 7th Grade
- Integral AP Calculus AB
- Intermediate Value Theorem AP Calculus AB
- Interquartile Range (IQR) 6th Grade
- Inverse Function Algebra 1
- Inverse Matrix Precalculus
- Inverse Operations 6th Grade
- Inverse Trigonometric Functions Precalculus
- Irrational Number 8th Grade
- Isosceles Triangle Theorem Geometry
L
- L'Hôpital's Rule AP Calculus AB
- Law of Cosines Geometry
- Law of Large Numbers AP Statistics
- Law of Sines Geometry
- Least Common Multiple (LCM) 6th Grade
- Least-Squares Regression Line AP Statistics
- Like Terms 6th Grade
- Limit AP Calculus AB
- Limit at Infinity AP Calculus AB
- Limit Definition of the Derivative AP Calculus AB
- Line of Best Fit 8th Grade
- Line Segment Geometry
- Linear Equation 8th Grade
- Linear Function 8th Grade
- Linear Regression Algebra 1
- Literal Equation Algebra 1
- Logarithm Algebra 2
- Logarithm Rules Algebra 2
- Long Division 6th Grade
M
- Magnitude of a Vector Precalculus
- Margin of Error Algebra 2
- Markup 7th Grade
- Matrix Precalculus
- Mean Absolute Deviation (MAD) 6th Grade
- Mean Value Theorem AP Calculus AB
- Mean, Median and Mode 6th Grade
- Midline Algebra 2
- Midpoint Formula Geometry
- Midsegment of a Triangle Geometry
- Monomial Algebra 1
- Multiplicity of a Zero Algebra 2
- Mutually Exclusive Events Algebra 2
N
- Natural Logarithm (ln) Algebra 2
- Negative Exponent 8th Grade
- Net (3D Figure) 6th Grade
- Nonlinear Function 8th Grade
- Normal Distribution Algebra 2
- nth Root Algebra 2
- Null and Alternative Hypotheses AP Statistics
O
- One-Sided Limit AP Calculus AB
- One-Step Equation 6th Grade
- One-to-One Function Algebra 2
- Opposite Numbers 6th Grade
- Optimization (Calculus) AP Calculus AB
- Order of Operations (PEMDAS) 6th Grade
- Ordered Pair 6th Grade
- Outlier 6th Grade
P
- P-Value AP Statistics
- Parabola Algebra 1
- Parallel Lines Geometry
- Parallelogram Geometry
- Parametric Equations Precalculus
- Pascal's Triangle Precalculus
- Percent 6th Grade
- Percent Change 7th Grade
- Percent Decrease 7th Grade
- Percent Error 7th Grade
- Percent Increase 7th Grade
- Percentile AP Statistics
- Perfect Square 8th Grade
- Perfect Square Trinomial Algebra 1
- Period of a Function Algebra 2
- Permutation Precalculus
- Perpendicular Bisector Geometry
- Perpendicular Lines Geometry
- Phase Shift Precalculus
- Pi (π) 7th Grade
- Piecewise Function Algebra 1
- Point, Line and Plane Geometry
- Point-Slope Form Algebra 1
- Polar Coordinates Precalculus
- Polar Form of a Complex Number Precalculus
- Polynomial Algebra 1
- Polynomial Long Division Algebra 2
- Population (Statistics) 7th Grade
- Power Rule AP Calculus AB
- Prime Factorization 6th Grade
- Probability 7th Grade
- Product Rule AP Calculus AB
- Proportion 7th Grade
- Proportional Relationship 7th Grade
- Pythagorean Identity Algebra 2
- Pythagorean Theorem 8th Grade
- Pythagorean Triple 8th Grade
Q
- Quadrants 6th Grade
- Quadratic Formula Algebra 1
- Quadratic Function Algebra 1
- Quartiles 6th Grade
- Quotient 6th Grade
- Quotient Rule AP Calculus AB
R
- Radian Geometry
- Radius and Diameter 7th Grade
- Random Sample 7th Grade
- Random Variable AP Statistics
- Range (Statistics) 6th Grade
- Rate 6th Grade
- Rate of Change 8th Grade
- Ratio 6th Grade
- Ratio Table 6th Grade
- Rational Exponents Algebra 1
- Rational Expression Algebra 2
- Rational Function Algebra 2
- Rational Number 6th Grade
- Rational Root Theorem Precalculus
- Ray Geometry
- Real Numbers 8th Grade
- Reciprocal 6th Grade
- Rectangular Prism 6th Grade
- Recursive Formula Algebra 1
- Reference Angle Algebra 2
- Reflection (Geometry) 8th Grade
- Related Rates AP Calculus AB
- Relative Frequency 8th Grade
- Remainder Theorem Algebra 2
- Repeating Decimal 7th Grade
- Residual Algebra 1
- Rhombus Geometry
- Riemann Sum AP Calculus AB
- Rigid Transformation Geometry
- Rotation (Geometry) 8th Grade
S
- Sales Tax 7th Grade
- Same-Side Interior Angles Geometry
- Sample Space 7th Grade
- Sampling Bias AP Statistics
- Sampling Distribution AP Statistics
- Scale Drawing 7th Grade
- Scale Factor 7th Grade
- Scatter Plot 8th Grade
- Scientific Notation 8th Grade
- Second Derivative Test AP Calculus AB
- Separation of Variables AP Calculus AB
- Sigma Notation Algebra 2
- Significance Level (Alpha) AP Statistics
- Similar Figures 8th Grade
- Similar Triangles Geometry
- Simple Interest 7th Grade
- Simple Random Sample AP Statistics
- Simplifying Radicals Algebra 1
- Simulation 7th Grade
- Sine Geometry
- Skewed Distribution AP Statistics
- Slope 8th Grade
- Slope Field AP Calculus AB
- Slope Formula 8th Grade
- Slope-Intercept Form 8th Grade
- SOHCAHTOA Geometry
- Solid of Revolution Geometry
- Special Right Triangles Geometry
- Square Root 8th Grade
- Squeeze Theorem AP Calculus AB
- Standard Deviation Algebra 1
- Standard Error AP Statistics
- Standard Form of a Linear Equation Algebra 1
- Standard Form of a Quadratic Algebra 1
- Statistical Question 6th Grade
- Stratified Random Sampling AP Statistics
- Substitution Method 8th Grade
- Sum and Difference Formulas Precalculus
- Supplementary Angles 7th Grade
- Surface Area 6th Grade
- Synthetic Division Algebra 2
- System of Equations 8th Grade
- System of Inequalities Algebra 1
T
- t-Distribution AP Statistics
- t-Test AP Statistics
- Tangent (Trigonometric Ratio) Geometry
- Tangent to a Circle Geometry
- Tape Diagram 6th Grade
- Term (Algebra) 6th Grade
- Terminating Decimal 7th Grade
- Theoretical Probability 7th Grade
- Transformations of Functions Algebra 2
- Translation (Geometry) 8th Grade
- Transversal 8th Grade
- Tree Diagram 7th Grade
- Triangle Angle Sum Theorem 8th Grade
- Triangle Congruence (SSS, SAS, ASA, AAS) Geometry
- Triangle Inequality Theorem 7th Grade
- Trigonometric Identities Precalculus
- Trinomial Algebra 1
- Two-Column Proof Geometry
- Two-Step Equation 7th Grade
- Two-Step Inequality 7th Grade
- Two-Way Table 8th Grade
- Type I and Type II Errors AP Statistics
U
- U-Substitution AP Calculus AB
- Unit Circle Algebra 2
- Unit Price 6th Grade
- Unit Rate 6th Grade
V
- Variable 6th Grade
- Vector Precalculus
- Vertex Form Algebra 1
- Vertex of a Parabola Algebra 1
- Vertical Angles 7th Grade
- Vertical Line Test Algebra 1
- Volume 6th Grade
- Volume of a Cone 8th Grade
- Volume of a Cylinder 8th Grade
- Volume of a Pyramid Geometry
- Volume of a Sphere 8th Grade
X
- X-Intercept Algebra 1
Y
- Y-Intercept 8th Grade
Z
- Z-Score Algebra 2
- Zero Exponent 8th Grade
- Zero Product Property Algebra 1
- Zeros of a Function Algebra 1