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Numeral prefix
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: triangle, quadrilateral, pentagon, hexagon, octagon (shape with 3 sides, 4 sides, 5 sides, 6 sides, 8 sides)simplex, duplex (communication in only 1 direction at a time, in 2 directions simultaneously)unicycle, bicycle, tricyc...
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