I am looking for a proper single work term to describe one third of a calendar year. Trimester does not seem correct as it seems to refer to a period of three months (one third of a pregnancy or one third of an academic year).
The term for a four month period is quadrimester. Quad = 4 mense= month
triannually, triannually ,1/3 of the year
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3 years ago
3 months ago