This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A weight used as a counterbalance.

n. A force or influence equally counteracting another.

n. A heavy mass of often iron or concrete, mechanically linked in opposition to a load which is to be raised and lowered, with the intent of reducing the amount of work which must be done to effect the raising and lowering. Counterweights are used, for example, in cable-hauled elevators and some kinds of movable bridges (e.g. a bascule bridge).

v. To fit with a counterweight.

n. A weight in the opposite scale; a counterpoise.

v. constitute a counterweight or counterbalance to

n. a weight that balances another weight

"When a suitable counterweight is added at one end so that the reaction on one fulcrum is zero, the block can be spun asymmetrically 180 degrees about the other, giving a horizontal displacement (here's the basic physics)."

counterweighted    counterweights   

counterbalance    oppose   

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