In the exact center.

The exact center / (engineering) Alternative form of dead center.

To hit or place in the exact center.

(automotive) A position in the four-stroke combustion process wherein the piston is at the topmost point in its stroke. This can either be during the compression phase or the combustion phase.

(automotive) A position in the four-stroke combustion process wherein the piston is at the bottommost point in its stroke.

plural of top dead center