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 [*mega*]phone, [*mega*]hit, and [*mega*]byte. An easy way to remember that the prefix *mega-* means "large" is through the word [*mega*]store, which is simply a store that is very "large" in floor area.