Here in the U.S. it has two meanings (confusing). It can mean every two weeks or twice each week (semiweekly). For salary paychecks, it typically means every two weeks.
http://dictionary.reference.com/search?q=bi-weekly
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"When the debate is lost, slander becomes the tool of the loser." - Socrates
Vita contingit, Vive cum eo. (Life Happens, Live With it.)
"Life is not measured by the number of breaths we take, but by the moments that take our breath away." -- author unknown
"De omnibus dubitandum"