What's the bi-annual flight review all about?

In article ,
"Capt. Geoffrey Thorpe" The Sea Hawk @See My Sig.com wrote:

Biannual is twice a year.

Just a stupid nit: according to my dictionary, "biannual" can mean
either twice a year or once every two years. "Biennial" removes the
ambiguity and means every two years, and "semiannual" always means twice
a year. (I just found this interesting and wanted to share, no criticism
meant.)

We now return you to our regularly scheduled aviation discussion.

--
Mike Ash
Radio Free Earth
Broadcasting from our climate-controlled studios deep inside the Moon