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Is there a fourth word in this series: weekly, biweekly, triweekly, ...?

If not, and I had to coin a word, then would "quadweekly", "quadriweekly", or some other word be more etymologically appropriate? For example, is there a similar series from which I could borrow the prefix for "four"?

UPDATE: "Monthly" isn't appropriate because one month is a few days more than four weeks.

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Are you looking for an alternative to "monthly"? –  Thale Feb 23 '12 at 21:49
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I once worked in a company that handled computerised accounts/payroll for lots of others. We used to call the stuff based on "four-week accounting period" fwaply [reports, etc.], to distinguish them from reports/companies based on calendar month. –  FumbleFingers Feb 23 '12 at 21:53
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If you wanted to impress, you could always try 'quadrihebdomadal'. –  Barrie England Feb 23 '12 at 22:04
    
I like the sound of "fwaply". I'm afraid other people will find it rather unobvious though ;-) –  Michael Liu Feb 23 '12 at 22:07
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@MichaelLiu The words with bi- are not obvious/unambiguous either. Consider "bimonthly". It can mean both "once every two months" and "twice a month". –  Alenanno Feb 23 '12 at 22:14

2 Answers 2

Is there a compelling reason you cannot use "every four weeks"? The advantage of using the phrase is that there is less possibility of being misunderstood.

EDIT: You could also word it as "four-week" in the context you give in your comment below.

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I have the phrases "weekly recurrence", "biweekly recurrence", "monthly recurrence", "annual recurrence", etc. For consistency, I'm looking for "(adjective) recurrence" for the four-week case. –  Michael Liu Feb 23 '12 at 22:15
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If you coin a new word, it's possible you might confuse, annoy, amuse, or confound users. If you use something like "four-week recurrence" then you will improve usability, while sacrificing only a little consistency. –  Mark Beadles Feb 23 '12 at 22:49
    
@MichaelLiu As further evidence of its naturalness, I submit the fact that you yourself used "four-week" as an adjective in your comment :) –  Mark Beadles Feb 24 '12 at 2:26

Per Google, bifortnightly and bi-fortnightly together have been used about 5000 times on the web, frequently as objects of ridicule rather than as serious terms for "four-week-ly", occasionally as examples of misunderstanding of whether bi is a multiplier or a divider.

Although the lunar cycle is often thought of as 28 days, lunarly doesn't actually work to indicate 28 days, because the moon's sidereal period is only 27.3 days.

Regarding quadweekly and quadriweekly, I like quatriweekly or quatri-weekly better. Quadroon and quadrant, for example, use quadr- as one-fourth, while quatrain uses quatr- as four; but the roots of all of them are closely related to words meaning four.

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