bissextile

US:USA pronunciation: respellingUSA pronunciation: respelling(bī sekstil, -tīl, bi-)


WordReference Random House Unabridged Dictionary of American English © 2025
bis•sex•tile  (bī sekstil, -tīl, bi-),USA pronunciation adj. 
  1. Timecontaining or noting the extra day of leap year:The years 1980 and 1984 were both bissextile.

n. 
  1. TimeSee leap year. 
  • Late Latin bi(s)sextilis (annus) leap year, equivalent. to bissext(us) bissextus + -ilis -ile
  • 1585–95


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