A numerical prefix is a
prefix that denotes a number, which is usually a multiplier for the thing being prefixed. Numerical prefixes are usually derived from the words for numbers in various languages, most commonly
Greek and
Latin, although this is not necessarily the case.Numerical prefixes occur in five contexts:They occur in
19th,
20th and
21st century coinages, mainly the terms that are used in relation to or that are the names of technological innovations, such as and .They occur in constructed words such as
systematic names. Systematic names use numerical prefixes derived from Greek, with one principal exception, . They occur as prefixes to units of measure in the
SI system. See
SI prefixes.They occur as prefixes to units of computer data. See
binary prefixes.They occur in words in the same languages as the original number word, and their respective derivatives. (Strictly speaking, some of the common citations of these occurrences are not in fact occurrences of the prefixes. For example: is not formed from , but is in fact derived from the same shared Latin root – .)
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