noun an interval of two octaves and a third.
2. seventeenth ·adj next in order after the sixteenth; coming after sixteen others.
3. seventeenth ·noun the next in order after the sixteenth; one coming after sixteen others.
4. seventeenth ·adj constituting or being one of seventeen equal parts into which anything is divided.
5. seventeenth ·noun the quotient of a unit divided by seventeen; one of seventeen equal parts or divisions of one whole.