1. occurring every two weeks.
  2. occurring twice a week; semiweekly.

noun, plural bi·week·lies.

  1. a periodical issued every other week.


  1. every two weeks.
  2. twice a week.

adjective, adverb

  1. every two weeks
  2. (often avoided because of confusion with sense 1) twice a week; semiweeklySee bi- 1

noun plural -lies

  1. a periodical published every two weeks

also bi-weekly, 1865, from bi- + weekly. The sense “twice a week” is the first attested, but that of “every two weeks” is equally implied.

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