The abstract science of number, quantity, and space, either as abstract concepts (pure mathematics), or as applied to other disciplines such as physics and engineering (applied mathematics).

She decided to major in mathematics because she enjoyed solving complex problems.

The mathematical aspects or features of a subject or activity.

The mathematics of the game are quite complex, involving probability and strategy.

mathematicsadjective

Relating to mathematics; concerned with or involving mathematics (used attributively before a noun).

The university offers a mathematics course for engineers.