tri-annual

English

Etymology

From tri- +‎ annual.

Adjective

tri-annual (not comparable)

  1. Alternative form of triannual.
    • 2023 September 6, Anthony Lambert, “Train paths: more space for freight?”, in RAIL, number 991, page 34:
      "I don't think moving to tri-annual timetable changes brings any benefit to the freight sector.
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