1
a
: two
bilateral
b
: coming or occurring every two
bicentennial
c
: into two parts
bisect
2
a
: twice : doubly : on both sides
biconvex
b
: coming or occurring two times
biannual
compare semi-
3
: between, involving, or affecting two (specified) symmetrical parts
bilabial
4
a
: containing one (specified) constituent in double the proportion of the other constituent or in double the ordinary proportion
bicarbonate
b
: di- sense 2
biphenyl
What do bimonthly and biweekly mean?: Usage Guide
Many people are puzzled about bimonthly and biweekly, which are often ambiguous because they are formed from two different senses of bi-: "occurring every two" and "occurring two times." This ambiguity has been in existence for nearly a century and a half and cannot be eliminated by the dictionary. The chief difficulty is that many users of these words assume that others know exactly what they mean, and they do not bother to make their context clear. So if you need bimonthly or biweekly, you should leave some clues in your context to the sense of bi- you mean. And if you need the meaning "twice a," you can substitute semi- for bi-. Biannual and biennial are usually differentiated.
variants
or bio-
1
: life : living organisms or tissue
bioluminescence
biosphere
2
: biographical
biopic
bismuth
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Merriam-Webster unabridged
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