A twelfth is one part out of twelve equal parts.
When people talk about music or time, they often refer to a twelfth as an interval. For example, if you play a piano and press two keys, one whole step apart, that's a twelfth. It's not a complicated math problem, but rather a way to describe how notes sound when played together. In music theory, there are certain patterns of intervals, like the major scale, which is made up of seven consecutive twelfths (starting from C). Some musicians might talk about chords that have specific qualities due to their use of twelfths.
The ordinal form of the number twelve, describing a person or thing in position number 12 of a sequence.
Example: The answer appears on the twelfth page of the book.
