bi·week·ly

[bahy-week-lee] adjective, noun, plural bi·week·lies, adverb
adjective
1.
occurring every two weeks.
2.
occurring twice a week; semiweekly.
noun
3.
a periodical issued every other week.
adverb
4.
every two weeks.
5.
twice a week.

Origin:
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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Biweekly is always a great word to know.
So is interrobang. Does it mean:
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Collins
World English Dictionary
biweekly (baɪˈwiːklɪ) [Click for IPA pronunciation guide]
 
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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Etymonline
Word Origin & History

biweekly
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
Typically shareholders receive a weekly or biweekly delivery of a box of goods
  that includes what is in season at the time.
We meet weekly for a year and then biweekly after that.
Biweekly programs let you get in an extra mortgage payment every year, reducing
  principal and interest sooner.
Today is the first anniversary of this biweekly column.
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