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Prefixes are key morphemes in English vocabulary that begin words. The origin of the prefix mega- is an ancient Greek word which meant “large.” This prefix appears in a somewhat “large” number of “large” English vocabulary words, such as megaphone, megahit, and megabyte. An easy way to remember that the prefix mega- means “large” is through the word megastore, which is simply a store that is very “large” in floor area.
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