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biweekly, bimonthly, biannual

(A similar topic is discussed in French in the article BIHEBDOMADAIRE.)

Biweekly means either twice a week or every two weeks and can therefore create confusion for the reader. A similar problem occurs with bimonthly and biannually.

To ensure clarity, replace these ambiguous terms with the precise expressions "twice a week (or month or year)" or "every two weeks (or months or years)."

  • The meetings occur twice a week / every two weeks. (not biweekly)
  • We get paid twice a month / every two months. (not bimonthly)
  • We attend a family reunion twice a year / every two years. (not biannually)

When the adjective biannual means "twice a year," it can be replaced with semi-annual or twice-yearly; when it means "every two years," it can be replaced with biennial.

  • The semi-annual / twice-yearly (not biannual) reunion is always a favourite.

OR

  • The biennial (not biannual) reunion is always a favourite.

Note that no hyphen is used after the prefix bi-.