noun
solidarity
sah-lih-DAIR-uh-tee/ˌsɑːlɪˈdærəti/
Unity or mutual support among people with shared interests or commitments.
The workers show solidarity by supporting their injured colleague together.

Etymology
Solidaire describes people as interdependent: their interests and responsibilities are bound together. Solidarity names that shared responsibility and unity, not merely agreement on an issue.
In context
PROMOTE UNITY, SOLIDARITY AND A FIGHTING SPIRIT IN THEIR PEOPLE
More examples
- Nurses march in solidarity with the striking teachers.
- Working toward a common goal builds solidarity among team members.
- We wear these ribbons as a sign of solidarity.