every three weeks.
three times a week.


occurring or appearing every three weeks.
occurring or appearing three times a week.

noun, plural tri·week·lies.

a triweekly publication.

Origin of triweekly

First recorded in 1825–35; tri- + weekly Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for triweekly

Contemporary Examples of triweekly

Historical Examples of triweekly

  • There is a post office in the village, through which a triweekly mail passes to and from Natchez.

    The South-West

    Jonathon Holt Ingraham

  • He would hear no news but that which she translated from the triweekly French paper published in the city.

    Round the Block

    John Bell Bouton

British Dictionary definitions for triweekly


adjective, adverb

every three weeks
three times a week

noun plural -lies

a triweekly publication
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