alliance

/əˈlaɪəns/
noun
  1. A formal agreement or relationship between two or more groups, countries, or people to work together for a common goal.
    • The alliance between the environmental groups helped pass the new clean air law.
    • Our company is in a strategic alliance with a tech firm to develop new software.
    • The two countries formed a military alliance to protect each other from invasion.
  2. A close association or connection based on shared interests or goals.
    • The alliance between the teachers and parents improved the school's programs.
    • The political alliance brought together parties from across the spectrum.
    • They formed an alliance of local businesses to promote tourism.
Antonyms