The letter "e" because its twice in lifetime, once in year, twice in week, and never in a day
The letter "E."
the word annum means a period of a year. the more common term is "annual" 650k means 650,000 so your phrase means 650,000 per year
Biweekly is an ambiguous term : it can mean once every two weeks or twice a week! Consequently there are 26 biweeklies in 2016 or 104 of them.
The letter E
Biannual. Biannual can mean occurring every two years, OR occurring twice a year. Biennial, on the other hand, means only the former: occurring every two years.
Biannual biannual means twice per year. Biennial means every two years or every other year.
An event occurs 2 times in a year
bi means two and annual means year so biannual is twice a year. __ As distinct from biennial which means every two years.
Semiannual means every six months which would make it twice a year. Biannual can mean twice a year but it's ambiguous because it can also mean every two years.