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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.
A second full moon in one calendar month is usually called a blue moon and this occurs approximately every 3 years. The saying Once in a blue moon refers to something that does not happen often (like a blue moon.) However, a blue moon can also refer to the third full moon in a season with four full moons.