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tri-annual. In DICTIOUS you will not only get to know all the dictionary meanings for the word
tri-annual, but we will also tell you about its etymology, its characteristics and you will know how to say
tri-annual in singular and plural. Everything you need to know about the word
tri-annual you have here. The definition of the word
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English
Etymology
From tri- + annual.
Adjective
tri-annual (not comparable)
- 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.