'fortnightly meetings' is correct and usable in written English. You can use it to refer to meetings that occur every two weeks. For example, "At our company, we hold fortnightly meetings to discuss current projects.".
In Schwerin, Ekhof initiated a dramatic academy (1753) with fortnightly meetings in which he discussed with his colleagues the problem of the actor's craft and civic responsibility.
With the fortnightly meetings that division heads now attend, a fragmented collection of businesses employing some 90,000 people has become a little more co-operative.
To Walker's obvious delight, Lamb pledged to have fortnightly meetings to discuss mental health issues with officials and experts in the field.
Labour's policy on Brexit is discussed at fortnightly meetings of a "Brexit subcommittee", chaired by Corbyn, with Starmer, Thornberry and Abbott present.
A spokeswoman for Lynham said the state's top bureaucrat, the coordinator general Barry Broe, would "discuss any issues Adani may have on Friday at their next fortnightly meeting".
The South African cabinet staged a show of support for the coach Jake White and his World Cup-winning team yesterday by wearing Springbok kit for their fortnightly meeting in Cape Town.
A fortnightly meeting will be held to enable staff to troubleshoot and to ensure fidelity.
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Software Engineer at Adobe, UK