Biweekly
WordNet
adjective
(1) Occurring every two weeks
(2) Occurring twice a week
adverb
(3) Every two weeks
"He visited his cousins fortnightly"
(4) Twice a week
"He called home semiweekly"
noun
(5) A periodical that is published twice a week or every two weeks (either 104 or 26 issues per year)