The term ONE, FOR ONE can be broken down into five different crossword solutions: SONG (4 letters), BILL (4 letters), DIGIT (5 letters), NUMBER (6 letters), and CUBEROOT (8 letters). A SONG is a musical composition that is typically sung or performed. A BILL is a document that is used to request payment for goods or services. A DIGIT is a single symbol used in a numeral system to represent numbers. A NUMBER is a mathematical object used to count, measure, and label. Finally, a cube root is the NUMBER that when multiplied by itself three times equals the original NUMBER.