Fractional part is a mathematical term that denotes the portion of a whole number that is less than one. There are several synonyms that can be used interchangeably for fractional part, such as decimal fraction, decimal, remainder, or fraction. Decimal fraction is the term mostly used in decimal notation, while remainder refers to the remaining part of the division after the integer has been found. A fraction can be a synonym for a fractional part, but only if it is less than one. Furthermore, percentage or ratio can function as synonyms in specific contexts, depending on the mathematical operation or formula being used. Overall, all these synonyms are relevant to any conversation related to mathematics or statistics.