biweekly

bi|week|ly /baɪw'iːkli/
[ADJ] ADJ n
A biweekly event or publication happens or appears once every two weeks. (AM)
He used to see them at the biweekly meetings.
...Beverage Digest, the industry's biweekly newsletter.
[ADV] ADV with v
Biweekly is also an adverb. (in BRIT, use fortnightly)
The group meets on a regular basis, usually weekly or biweekly.