Unilateralism (noun)

The practice or policy of making decisions or taking action independently, without the agreement or cooperation of others.

Origin:

From the word "unilateral" meaning "done or taken by one person or side only, without involving others".

Examples:

1. The country's policy of unilateralism in international relations made it a pariah state.
2. The company's unilateral decision to relocate was met with opposition.
3. The President's unilateral actions were criticized for lack of transparency.
4. The government's unilateral approach to tackling the crisis was seen as heavy handed.
5. The company's unilateralism in the negotiations led to a breakdown in talks.