bi- /bʌɪ/

b

I. combining form

1. two; having two

bicoloured
biathlon.
See also bin-.
2. occurring twice in every one or once in every two

bicentennial.
3. lasting for two

biennial.
4. doubly; in two ways

biconcave.
5.
[Chemistry] (in names of compounds) containing two atoms or groups of a specified kind

biphenyl.
6.
[Chemistry] denoting an acid salt

bicarbonate.
7.
[Botany]
[Zoology] (of division and subdivision) twice over

bipinnate.
– origin from Latin, ‘doubly, having two’; related to Greek di- ‘two’. / usage: The meaning of bimonthly (and other similar words such as biweekly and biyearly) is ambiguous. Such words can either mean ‘occurring or produced twice a month’ or ‘occurring or produced every two months’. The only way to avoid this ambiguity is to use alternative expressions like every two months and twice a month. Biannual and biennial are also confusing: biannual means ‘occurring twice a year’ and biennial means ‘occurring every two years’.

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