Intermediate (B1)
IPA: //traɪˈwiːkli//
KK: /traɪˈwiːkli/
Definition
Happening or occurring every three weeks or three times a week.
Example
The magazine is published triweekly, so you can expect a new issue every three weeks.
Conversation

Hey, have you heard about the new gym class that meets triweekly?

No, I didn't! That sounds interesting, though.

Yeah, I think it would be a great way to stay fit without too much commitment.

Definitely! I love the idea of a triweekly schedule.
Synonyms & Antonyms
Definition
Occurring every three weeks or three times a week.
Example
The magazine is published triweekly, so you can expect a new issue every three weeks.
Conversation

Hey, do you want to meet for coffee triweekly starting next month?

That sounds great! I love the idea of a regular catch-up.

Awesome! We can choose a different café each time we meet.
Definition
A publication or event that occurs three times a week.
Example
The magazine is a triweekly, so it comes out every Monday, Wednesday, and Friday.
Conversation

Have you seen the latest issue of that triweekly magazine?

Not yet, but I'm really looking forward to it.

I love how they cover so many interesting topics in each triweekly release.
Root Explanation
Triweekly → It is formed from "tri-" (meaning three) and "weekly" (from Old English "wēce", meaning week). The word "triweekly" means occurring three times a week.
Memory Tip
Think of 'three' ('tri-') happening 'every week' — that's what triweekly means.