1. A matrix is a two-dimensional array of numbers.

2. A matrix is a rectangular array of elements arranged in rows and columns.

3. A matrix is a collection of values stored in cells arranged in rows and columns (or axes).

4. A matrix is a table of data.

5. A matrix is a set of numbers arranged in rows and columns, where each row represents a different variable and each column represents a different value of that variable.

6. A matrix is a generalization of a table.

7. A matrix is a mathematical object consisting of a number of rows and columns.

8. A matrix is a type of data structure that stores information about a quantity of interest

9. A matrix is a representation of a linear transformation.

10. A matrix is a square array of numbers.

11. A matrix is a 2D array of numbers.

12. A matrix is a multidimensional array of numbers.

13. A matrix is a way of representing a function.

14. A matrix is a tool for solving systems of equations.