Greek and Latin words for numbers

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Prefixes deriving from the Greek and Latin words for numbers form part of many English words, in particular, words for units of measurement (e.g., milligram, centimetre) and for geometrical figures (e.g., hexagon, octahedron).

The following table shows the Greek and Latin words for the cardinal and ordinal numbers from 1 to 12, and for a few larger numbers (20, 100, and 1,000). A cardinal number expresses quantity - so one, two, and three are cardinal numbers - while an ordinal number expresses order - so first, second, and third, are ordinal numbers. (The word 'cardinal' means 'principal, chief, or most important': it derives from the Latin word cardo, which means 'a hinge, i.e., that on which something else depends'. The cardinal numbers are the numbers on which all other types of number (e.g., ordinal numbers, fractions) depend.)

English cardinal number English ordinal number Greek cardinal number Greek ordinal number Latin cardinal number Latin ordinal number
one first heis (fem. mia, neut. hen) protos unus primus
two second duo deuteros duo secundus
three third treis tritos tres tertius
four fourth tettares tetartos quattuor quartus
five fifth pente pemptos quinque quintus
six sixth hex hektos sex sextus
seven seventh hepta hebdomos septem septimus
eight eighth okto ogdoos octo octavus
nine ninth ennea enatos novem nonus
ten tenth deka dekatos decem decimus
eleven eleventh hendeka hendekatos undecim undecimus
twelve twelfth dodeka dodekatos duodecim duodecimus
twenty twentieth eikosi - viginti vicesimus
hundred hundredth hekaton - centum centesimus
thousand thousandth chilioi - mille millesimus

For more see Greek or Latin numerical prefix?, Prefixes in units of measurement, Prefixes for very high numbers, and Prefixes in words for geometrical figures.