occurring, taking place, done, or acted upon every three months.

1855–60; tri- + monthly Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To trimonthly
World English Dictionary
trimonthly (traɪˈmʌnθlɪ)
adj, —adv
every three months

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Food instruments may be issued monthly, bi-monthly or trimonthly, according to the participant's nutritional risk and needs.
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