| A | B |
|---|
| Bakers dozen | thirteen |
| Bicentennial | 200th anniversary |
| Brace | two of a kind; pair; couple |
| Centenarian | one who is 100 or older |
| Decade | period of ten years |
| Decathlon | track-and-field contest consisting of ten events |
| Decimate | destroy ten or more percent, or a large portion of |
| Dichotomy | division in two; split |
| Fathom | measure of water depth equaling six feet |
| Millennium | period of 1,000 years |
| Pentagon | plane figure of fived sides and five angles |
| Plurality | number of votes by which a winning candidate exceeds that of the runner-up |
| Quadrennial | occurring or being done every four years |
| Quadruped | four-footed animal |
| Score | group of twenty; twenty |
| Sesquicentennial | 50th anniversary |
| Sexagenarian | one who is at least sixty but less than seventy |
| Tithe | one tenth, or tenth part, of something paid as a contribution or tax to support a religious establishment |
| Treble | multiply by three; triple |
| Triumvirate | ruling body of three; troika |
