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).
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There is a difference between a duration period of three months as in "trimester" and an event occurring every 3 months as in "quarterly". In the same vein you would have a quadrimester or tri-annually, both being correct in the right context.