noun
unison
YOO-nih-sun/ˈjuːnɪsn/
Simultaneous action or agreement.
The rowers move in unison.

Etymology
Having one sound broadened figuratively into people or actions moving in agreement.
More examples
- The dancers turn in unison.
- Everyone nods in unison.
Forms
unison
Similar words
- synchrony
- Action occurring at the same time.
- concert
- Coordinated action toward a shared purpose.