Millesimal is a term used to describe a system of dividing something into a thousand parts. It is commonly used in the context of financial and legal matters. There are many synonyms for the word millesimal, including per mille, parts per thousand, and thousandth. These terms describe the same concept of dividing something into a thousand parts. Other synonyms for millesimal include decimal, fraction, and percentage. Each term has its unique application and context where it is more commonly used. Understanding these synonyms can help you communicate your ideas more effectively in various settings where precision is crucial.