weight

noun:a measure of the heaviness of an object, expressed in units such as pounds or kilograms
- The weight of the suitcase was over the airline's limit.
noun:a heavy object, especially one being lifted or carried
- He lifted the weight at the gym to build muscle.
noun:a standard object used as a measure of mass, often made of metal
- He added a 5‑gram weight to the scale to calibrate it.
noun:the importance, influence, or seriousness of something
- Her opinion carries a lot of weight in the committee.