The Cognātarium: Appendix A1
Numeric Prefixes
The table below lists many of the numeric prefixes used in the English language. The prefixes are listed more-or-less in the order of smallest to largest.
| Number | Prefix |
|---|---|
| septillionth (10−24) | yocto– |
| sextillionth (10−21) | zepto– |
| quintillionth (10−18) | atto– |
| quadrillionth (10−15) | femto– |
| trillionth (10−12) | pico– |
| billionth (10−9) | nano– |
| millionth (10−6) | micro– |
| thousandth (10−3) | milli– |
| hundredth (10−2) | centi– |
| tenth (10−1) | deci– |
| ½ | demi–, hemi–, semi– |
| 1 | uni–, mono–, hen– |
| 1½ | sesqui– |
| 2 | du–², di–², tw–, bi(n)– |
| 3 | tri–, ter– |
| 4 | qua–, tetra– |
| 5 | pent–, quinqu–, quint–, cinqu– |
| 6 | hex–, sex–², sest– |
| 7 | sept–, hept– |
| 8 | oct– |
| 9 | non–, ennea– |
| 10 | dec– |
| 20 | vic– |
| 100 | cent–, hecto– |
| 1,000 | mill–, kilo–, chili– |
| 10,000 | myria– |
| million (106) | mega– |
| billion (109) | giga– |
| trillion (1012) | tera– |
| quadrillion (1015) | peta– |
| quintillion (1018) | exa– |
| sextillion (1021) | zetta– |
| septillion (1024) | yotta– |
Copyright © 2009 Daniel M. Short. All Rights Reserved.