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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.
The definition of bimonthly is happening every two months, or it could be used in place of semimonthly to mean twice a month. 1  An example of bimonthly used as an adjective is the phrase a bimonthly bill which means a bill that comes every two months. An example of bimonthly used as an adjective is the phrase a bimonthly paycheck which means a paycheck that comes two times a month.