1. formal agreements between countries, organizations, or groups to work together for mutual benefit or protection
2. close associations or unions formed for a common purpose

Examples

• The military alliances helped maintain peace in the region.
• Several countries formed trade alliances to boost their economies.
• The two companies created strategic alliances to share technology.
• Political alliances often shift during election seasons.
• NATO is one of the world’s most important defense alliances.
• Business alliances can help small companies compete with larger ones.
• The environmental groups formed alliances to fight climate change.