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Algebra
(noun)

A branch of mathematics in which letters and symbols are used to represent numbers and quantities in equations and formulas.

### Origin:

From arabic الجبر (al-jabr, "the reunion of broken parts"), the title of a 9th-century book by the persian mathematician al-khwarizmi.

### Examples:

- Algebra is a branch of mathematics dealing with equations.
- Algebra is used to solve mathematical problems.
- Algebra is a subject that students learn in school.
- Algebra is a tool for solving real-world problems.
- Algebra is essential for understanding calculus.