English Language & Usage Asked on April 2, 2021
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.
Confusingly (according to dictionary definitions) the same is also true of biweekly; bimonthly; and biyearly. All of them can mean once every two... or twice per...
In the case of biannual the OED gives its adjectival meaning as once every two years, but when used as a noun as meaning the same as biennial, i.e. every other year. Semi-annual can be often used to express "twice per year".
In view of the dichotomous meanings of biweekly, triweekly etc. all I can suggest is that where there is likely to be confusion that you avoid their use, in favour of once every three weeks etc. The OED recommends the use of the terms semi-weekly, semi-monthly, semi-annually to avoid any confusion when twice per... is intended.
Correct answer by WS2 on April 2, 2021
"Every three weeks" is the most unambiguous option.
The problem appears to be in the semantic nature of the prefixes which carry the double meanings:
Tri:
- word-forming element meaning "three, having three, once every three," from Latin tres (neuter tria) or Greek treis, trias "three".
Bi:
- word-forming element meaning "two, twice, double, doubly, once every two," etc., from Latin bi- "twice, double," from Old Latin dvi- (cognate with Sanskrit dvi-, Greek di-, Old English twi- "twice, double"), from PIE root *dwo- "two." Nativized from 16c. Occasionally bin- before vowels; this form originated in French, not Latin, and might be partly based on or influenced by Latin bini "twofold".
(Etynomline)
- All words except biennial referring to periods of time and prefixed by bi- are potentially ambiguous. Since bi- can be taken to mean either “twice each” or “every two,” a word like biweekly can be understood as “twice each week” or “every two weeks.” To avoid confusion, it is better to use the prefix semi- to mean “twice each” ( semiannual; semimonthly; semiweekly) or the phrase twice a or twice each (twice a month; twice a week; twice each year), and for the other sense to use the phrase every two (every two months; every two weeks; every two years).
Answered by user66974 on April 2, 2021
The only clear way to say it is "every three weeks" (or something similar). If you use words like triweekly, you will just confuse everyone. Even if their interpretation of the word is correct, they will be unable to rely on your interpretation also being correct and matching theirs.
Answered by Dominic Cronin on April 2, 2021
1x3, three a week
3x1 = 3 weeks or once every 3 weeks.
It's short, it defies language barriers, and it works.
Answered by Andrea on April 2, 2021
Why there are two different meanings for “triweekly”?
It's almost as though the language evolved rather than being properly designed.
Is there another word to indicate a period of exactly 3 weeks?
Yes, "three-weekly".
And for the other meaning (three times a week): "thrice-weekly".
Answered by rjpond on April 2, 2021
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