triweekly
triweekly Lexical Profile
triweekly Game Scores & Validity
• adjective
Occurring, appearing, or done three times a week.
"The patient was placed on a schedule of triweekly physical therapy sessions on Mondays, Wednesdays, and Fridays."
Occurring, appearing, or done once every three weeks.
"The municipal recycling crew follows a triweekly collection schedule for oversized yard waste."
• adverb
Three times a week.
"The commuter ferry sails triweekly between the mainland and the outer island."
Once every three weeks.
"The book club meets triweekly at the local community center."
• noun
A newspaper, periodical, or other publication issued three times a week or once every three weeks.
"The town's small newspaper began as a triweekly before expanding into a daily publication."
Word Nuance & Usage
Like 'biweekly', 'triweekly' is inherently ambiguous because it can mean either 'three times a week' or 'once every three weeks'; in precise writing, it is best to state the exact interval explicitly.