fifteenths

/F IH0 F T IY1 N TH S/
noun
  1. 1

    The person or thing in the fifteenth position.

  2. 2

    One of fifteen equal parts of a whole.

  3. 3

    The interval comprising two octaves.

Source: https://en.wiktionary.org/wiki/fifteenth, https://en.wiktionary.org/wiki/fifteenths