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The prefix bi- usually means âevery twoâ, so bimonthly means âevery two monthsâ.Semi- means âhalfâ or âhalfwayâ, so semimonthly means âevery two weeksâ. However, bimonthly can also mean âtwice a monthâ â but it is rarely used that way. It is best to remember that bi- is âevery twoâ and semi- is âhalfway.â.
biweekly (not comparable) Occurring once every two weeks. (chiefly Britain) Occurring twice a week (but see the Usage notes). Usage notes. Like bimonthly and biennially, but unlike biannually, in the adjective and adverb senses, the prefix bi-applies to the week rather than to the events that occur, therefore giving the sense of âevery two weeksâ.