adjective. Happening every two weeks.

adjective. Happening twice a week; semiweekly.

noun. A publication issued every two weeks.

adverb. Every two weeks.

adverb. Twice a week; semiweekly.

Occurring or appearing every two weeks: as, a biweekly magazine.

Fortnightly.

noun. A periodical issued once every two weeks; a fortnightly publication.

adjective. Occurring or appearing once every two weeks; fortnightly.

adjective. Occurring once every two weeks.

adjective. Occurring twice a week (but see the Usage notes).

adverb. Every two weeks.

adverb. Twice a week (but see the Usage notes).

noun. Something that is published or released once every two weeks.

adjective. occurring twice a week

adverb. twice a week

adjective. occurring every two weeks

adverb. every two weeks

noun. a periodical that is published twice a week or every two weeks (either 104 or 26 issues per year)

"The fellow participates in biweekly case conferences of children seen at the PCA."

fortnightly  semiweekly  

periodic  periodical  

serial  serial publication  series  

meekly  obliquely  sleekly  uniquely  weakly  

40-hour  bimonthly  brown-bag  chamber music  e-newsletter  

annual  biannual  biennial  bimonthly  catamenial