Wikipedia:

In physics and chemistry an intensive property (also called a bulk property) of a system is a physical property of the system that does not depend on the system size or the amount of material in the system. By contrast, an extensive property of a system does depend on the system size or the amount of material in the system. Some intensive properties, such as viscosity, are statistical in nature and not relevant to extremely small quantities.

Distinguishing between intensive and extensive properties:

Consider the joining of two identical systems: extensive properties (such as mass and volume) will change, but intensive properties (such as temperature and the density of the system) will not