A measure of capacity can refer to the volume of a container, or the amount of a substance that can fit inside it. Some common synonyms for this term include capacity, volume, size, magnitude, amount, and dimension. Capacity and volume are often used interchangeably, as they both refer to the amount of space that something can hold. Size and magnitude are similar, but typically refer to overall dimensions. Amount and dimension are broader terms that can apply to anything from weight to length. Ultimately, the choice of synonym will depend on the context in which it is being used, and the specific qualities that are being measured.