Modifies a noun

• birthday: Barrie Cook is 71, his work was recently shown at the the Tate Britain, to celebrate his seventieth birthday.

• anniversary: Visit Madrid's civil war sites 70 years on This year marks the seventieth anniversary of the start of the civil war.

• parallel: It remained to ascertain the exact position of this cape, which the maps place above the seventieth parallel.

• year: In 1684 Smith, then in his seventieth year, was appointed bishop of Carlisle.