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This question already has an answer here:

Does the bi prefix mean that it is every second month or twice a month?

marked as duplicate by tchrist, Andrew Leach Jul 28 '15 at 18:07

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Yes, the prefix means two, so bimonthly can mean twice a month or every second month. Always use context, look at the sentence or the surrounding paragraph. That should help you figure out which meaning is being used.

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