What does the word eightieth mean?

Usage examples for eightieth

  1. To this he added- Eightieth day, 11. 40 a. – Round the World in Eighty Days by Jules Verne
  2. The riot's been put down, he continued, but we're keeping two companies of Kragans in the city, and about a dozen airjeeps patrolling the section from Eightieth down to Sixty- fourth, and from the waterfront back to Eighth Avenue. – Uller Uprising by Henry Beam Piper, John D. Clark and John F. Carr