occurring every two weeks.
occurring twice a week; semiweekly.
noun, plural biweeklies.
a periodical issued every other week.
every two weeks.
twice a week.

1880–85; bi-1 + weekly

1. bimonthly, biweekly, semimonthly (see usage note at bi-) ; 2. biweekly, semiweekly (see usage note at bi-).

See bi-1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
biweekly (baɪˈwiːklɪ)
adj, —adv
1.  every two weeks
2.  See bi- (often avoided because of confusion with sense 1) twice a week; semiweekly
n , -lies
3.  a periodical published every two weeks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

also bi-weekly, 1865, from bi- + weekly (see week). The sense "twice a week" is the first attested, but that of "every two weeks" is equally implied.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Biweekly programs let you get in an extra mortgage payment every year, reducing
  principal and interest sooner.
Typically shareholders receive a weekly or biweekly delivery of a box of goods
  that includes what is in season at the time.
The suit contends that the firms sent bogus biweekly account statements,
  showing modest profits, to investors.
We meet weekly for a year and then biweekly after that.
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