trimonthly

[ trahy-muhnth-lee ]
/ traɪˈmʌnθ li /

adjective

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. 2020

British Dictionary definitions for trimonthly

trimonthly
/ (traɪˈmʌnθlɪ) /

adjective, adverb

every three months
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