英和和英

形容詞

triannual (not comparable)

1. Happening three times each year.

使用する際の注意点

• To avoid confusion between "triennial," once every three years, and "triannual," three times in one year, it is often better to substitute a less ambiguous phrase such as "three times a year" or "every four months."

参考

• triennial (every three years) which is sometimes confused with triannual (usually every four months).
• biennial (every two years).
• biannual (twice a year).
  • semiannual (also twice a year).

形容詞

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.