(to act as) a weight, force, equal to (another) and balancing it

offset an action

the state of being balanced (especially mentally or emotionally)

balance; evenness

to take away the effect or special quality of (something) by using something with an opposite effect or quality

counteract

to balance, make up for, (something)

counterbalance, compensate

to be more in value or importance than (something)

override, dominate

a weight hung so that it swings freely, especially to regulate the movement of a clock

something used to measure heaviness

a response to earlier action or activity; opposition to progress or change; (an instance of) a change in one substance caused by another

response