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Adjective: octennial  ók'te-nee-ul
  1. Happening every eighth year; lasting a period of eight years
    "Octennial parliaments have been established"

Encyclopedia: Octennial

Nearest

octane number
octane rating
octanedioic acid
octangular
Octans
octant
octatonic scale
octave
Octavian
octavo
octennial
octet
octette
octillion
octo-
October
October 12
October 24
October Revolution
Octoberfest
octodecimo