Similar case in point: “bimonthly” means “twice a month.” That makes sense.
But the definition for “bi-weekly” does not make sense.
What do you think?
Similar case in point: “bimonthly” means “twice a month.” That makes sense.
But the definition for “bi-weekly” does not make sense.
What do you think?
I was taught that the “bi” prefix was a multiplier and “semi” was a divider.
That meant biweekly, bimonthly, biannually were every 2 weeks, months, years and semi-weekly, semi-monthly, semi-annually were every half a week, half a month, and half a year.
Then the real world intruded and I’ve been confused ever since. About the only time I hear “semi” and “bi” used on a regular basis the way I expect is with pay periods. Biweekly is every two weeks and semi-monthly is twice a month.
Canada, by the way.
PS: I suppose bisexual and semi trailers also fit my expectations.
I’m on your side. Your rule makes sense, and what other people are doing doesn’t make sense.
Stick to your rule and tell everyone else they’re wrong.
The way of the internet
I never heard that semi meant 1/2. I’ve always thought of semi as rather vague tbh. Meaning that there is no set amount of time between things.
bi- means two, as in bicycle: two wheels (circles)
semi- means half, as in semicircle: half of a circle
The problem is that the prefixes can be parsed as affecting either duration/interval as in (bi-week)ly, every two weeks, or frequency as in bi-(weekly), two times weekly. The same applies to semi-.
Personally I find the frequency interpretation a bit of a stretch—“two” is not the same as “two times” or “twice”—so I would tend to read e.g. bimonthly as every two months rather than twice each month.
You can bisect a circle to make two semicircles!
But if it’s semicircular…
bi-sect: cut into two parts; from Latin “bi-”, two, and “secare”, to cut.
The “sect” part is critical. “bi-” on its own doesn’t imply division.
Heh, yeah, I’m just messing with people here 😆
(This language confusion is mildly amusing, in the apparent inherent ambiguity we’ve created)
It all comes down to common usage, either interpretation can work. It’s like the phrase “I could care less” now means entirely opposite things to some people.
Biannual means twice a year here. Biennial is used for every two years.
Similarly for biweekly, we have fortnightly for every two weeks which means no-one uses biweekly to mean the same thing.
It’s all just down to common usage though.
This was how I learnt it, too.
Very simple: bi = x2, semi = /2.
Lots of people use the terms wrong, though.
Does weekly mean the frequency or the interval length? Either way, the bi doubles it - to twice the frequency, or twice the pause in between events.
I think either interpretation is fair.