trimonthly

[trahy-muhnth-lee]
adjective
occurring, taking place, done, or acted upon every three months.

Origin:
1855–60; tri- + monthly

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Collins
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
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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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