What does the term 'cask strength' mean on a whisky?

The term 'cask strength' refers specifically to whisky that has been bottled without any dilution. This means the whisky is taken directly from the cask at its natural strength, which can often result in a higher alcohol by volume (ABV) percentage compared to standard bottlings that have been diluted with water to reach a more typical drinking strength. Bottling at cask strength preserves the full intensity of flavor and character, offering a unique tasting experience that reflects the whisky's unaltered state.

The other options do not accurately represent what 'cask strength' means. For instance, aging for a minimum of 12 years relates to the whisky's maturation process, which is separate from the concept of cask strength. Dilution with water before bottling contradicts the definition of cask strength, as it implies a reduction in alcohol content. Similarly, the composition of the whisky, such as whether it is made from 100% malted barley, pertains to the type of whisky rather than its bottling strength. Thus, the correct understanding of 'cask strength' emphasizes the undiluted nature of the whisky at the time of bottling.