Unionism (noun)

1. The belief or practice of supporting or advocating for the formation and maintenance of labor unions.
2. The belief or practice of supporting or advocating for the unity and consolidation of different political units (such as countries or regions) into one single unit.

Origin:

The word "unionism" is derived from the word "union" which means the act or state of being united, and -ism which means a belief or practice.

Examples:

1. He was a strong advocate of unionism in the workplace.
2. The political party was committed to the unionism of the country.
3. Unionism is the belief that workers should band together for better wages and working conditions.
4. The movement for the unionism of Europe is gaining momentum.
5. He was a unionism supporter, believing that a united Europe would be stronger.