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The prefix bi- means two. Some words which begin with the prefix bi- include:
bicycle biplane bipartisan biped bilingual bilateral bicentennial biweekly bimonthly biennial
Here are the meanings of some of these words beginning with the bi- prefix:
bicycle - human-powered vehicle with two wheels biplane - an airplane with two wings biped - walks on two legs bilingual - knowing two languages bicentennial - two hundred years biennial - two years bimonthly - twice a month biweekly - twice a week