adjective
- occurring every two weeks.
- occurring twice a week; semiweekly.
noun, plural bi·week·lies.
- a periodical issued every other week.
adverb
- every two weeks.
- twice a week.
adjective, adverb
- every two weeks
- (often avoided because of confusion with sense 1) twice a week; semiweeklySee bi- 1
noun plural -lies
- 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.