# Numeral prefix

## Prefix derived from numerals or other numbers / From Wikipedia, the free encyclopedia

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"semi-" redirects here. For other uses, see semi (disambiguation).

**Numeral** or **number prefixes** are prefixes derived from numerals or occasionally other numbers. In English and many other languages, they are used to coin numerous series of words. For example:

- simplex, duplex (communication in only 1 direction at a time, in 2 directions simultaneously)
- unicycle, bicycle, tricycle (vehicle with 1 wheel, 2 wheels, 3 wheels)
- dyad, triad, tetrad (2 parts, 3 parts, 4 parts)
- biped, quadruped, hexapod (animal with 2 feet, 4 feet, 6 feet)
- September, October, November, December (7th month, 8th month, 9th month, 10th month)
^{[upper-alpha 1]} - binary, ternary, octal, decimal, hexadecimal (numbers expressed in base 2, base 3, base 8, base 10, base 16)
- septuagenarian, octogenarian (a person 70–79 years old, 80–89 years old)
- centipede, millipede (subgroups of arthropods with around 100 feet, or around 1000 feet)

In many European languages there are two principal systems, taken from Latin and Greek, each with several subsystems; in addition, Sanskrit occupies a marginal position.^{[upper-alpha 2]} There is also an international set of metric prefixes, which are used in the world's standard measurement system.