Context: I am looking for a term to indicate a time period of 3 weeks/21 days
For instance, a "fortnightly" event would occur every 2 weeks/14 days.
My Usage:
The "Read for the Visually Challenged" is a {fill in word for 3 weeks} event as part of CSR initiatives organised by our comapny.
When I searched online, I stumbled upon Triweekly, an adjective with two entirely different meanings
- occurring or appearing three times a week
- occurring or appearing every three weeks
[Merriam-Webster]
Ideally, I mean #2, but will this create a confusion? Why does it mean 2 different time periods? Is there another word to indicate a period of exactly 3 weeks?
P.S: I am not looking for "monthly" since this event is conducted every 3 weeks and it could be possible that it occurs in the first and fourth week of the same month.