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trimonthly

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

First recorded in 1855–60; tri- + monthly
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for trimonthly

trimonthly

adjective, adverb
  1. every three months
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012