A lot of things. equinoxes, solstices, (as a few) you need to elaborate more :)
Biannual describes something that occurs twice a year, once every half year.
semi-annually - happening every half year bi-annual - coming twice a year NOT biennial - happening every two years
KONA. He spends half his time there, and half in Calgary.
two and a half.
I was read a article about floods happening in china article writer mention the ratio of 4 floods happen in china every year i am not sure about that......... Thanks
It rains approximately half a ton every year
Demeter
Strange Things Happening Every Day was created in 1945.
Double half the money generated every year by people traveling - that is people really do 'travel'.
Hades was joined by her every half year in the Underworld.
approximately half a million
approximately half a million