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The amount that any container will hold.
This could be the amount of liquid that can be contained in a bottle, jug, vase, etc, or the amount of solids that could be contained in a box, car boot, shed, etc.
It is usually measured in cubic cm or millilitres.

Another word for volume; the amount of three-dimensional space an object encloses or uses up. It is used of containers which could be filled with a liquid or gas.