equipoisenoun [ U ]
/ˈek.wɪ.pɔɪz//ˈek.wɪ.pɔɪz/formala situation in which things are perfectly balanced:
There is in the artist's landscapes a delicate equipoise between the natural and the man-made.
If the evidence for and against the defendant's guilt is in equipoise, then the burden of proof is on the prosecution.