Twelves is a plural form of the word twelve, which refers to the number 12. Some synonyms for twelves could be dozens or duodecimo. Dozens refers to a quantity of 12, typically used when referring to a group of items or a bulk purchase. Duodecimo is a term used in bookbinding to describe a small, compact book made up of 12 pages. Another synonym for twelves could be midnight, as 12 o'clock at night is often referred to as midnight. Regardless of the synonym used, twelves remains a useful word when discussing quantities of a dozen.