Specialization (noun)

1. The process or act of specializing in a particular area of study or work.
2. The state of being specialized in a particular area.

Origin:

Late middle english (in the sense "the action of making something special"): from old french specialisation, or medieval latin specialisatio(n-), from specialis "particular, specific".

Examples:

1. His specialization is in computer science.
2. The company's specialization is in luxury cars.
3. The specialization of the economy has led to increased efficiency.
4. The university offers specialization in many fields.
5. The specialization of the workforce leads to increased productivity.