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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 issue is sometimes there are three payments in a month, and sometimes only two. To get around this, there is the twice-a-month payment system, which includes 24 (again) equal payments, but this time on an uneven timing basis (i.e., on the 15 th and the final day of the month).