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  • USA celebrated a bicentenary without confusion. No one suggests there should be another bicentenary in 8 years (ie, half a century later). Biennial plants have a two year life cycle, not a half year life cycle. No one mistakes a bicycle for something with half a wheel. It is disappointing that people have taken bimonthly / two-monthly / every two months to mean semi-monthly / twice monthly / every half month Commented Jul 2, 2018 at 11:51
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    I'd use fortnightly to describe something that happens every two weeks/twice a month, biweekly to describe something that happens twice a week, and bimonthly to describe something that happens every two months. It's not really intuitive, but the fact there's a unit of time meaning two weeks, which is roughly half a month, keeping in mind the biannual/biennial difference, relegates the ambiguity to intervals longer than two years. Commented Jul 2, 2018 at 16:40
  • Fortnight feels like British usage; it's rather rare in the US.
    – arp
    Commented Jul 7, 2018 at 1:55