# D

```
This glossary is far from complete. We are constantly adding math terms.
```**For instructions on adding new terms, please refer to** **Math Glossary Main Page**

Decimal Number

Decimal System

Decimal notation

Decimeter

Deduction

Deductive reasoning

Definition

Degree (Angle)

Degree notation

Degree (Polynomial)

Denominator

Dependent equations

Dependent variable

Diagonal

Diagonal (quadrilateral)

Diameter

Difference of squares

Differentiate

Direct variation

Directrix

Discrete variable

Discriminant

Disjoint sets

Disjunctive

Displacement

Distance

Distribution

Distributive (equation)

Distributive (whole number)

Divisibility

Division

Division (complex)

Division (decimal)

Division (fraction)

Division (integer)

Division (rational

Division (real)

Division (whole number)

Division by ten

Division by zero

Division combinations

Division with distribution

Division with number line

Divisor quotient (terms)

Domain (function)

Domain (relation)