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 hexadecimal and bicycle. · They occur in constructed words such as systematic names. Systematic names use numerical prefixes derived from Greek, with one principal exception, nona-. · 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 derivati

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