| A | B |
|---|
| Trilogy | a group of three literary or musical works that have a related theme |
| Trisect | to divide into three parts |
| Triumvirate | a group of three, especially in power |
| Quadrant | a quarter of a circle or of its circumference |
| Quartet | a musical composition of four voices |
| Quadrant | any of the four parts of an area divided by perpendicular lines |
| Quartet | a set of four, especially four musicians |
| Quatrain | a stanza or group of four lines of poetry |
| Decimate | to destroy one in every ten |
| Decimate | to destroy a large part of |
| Decathlon | an athletic contest in which each contestant takes part in ten events |
| Bicentennial | a two- hundredth anniversary |
| Bicentennial | happening every 200 years |
| Centenary | pertaining to a 100-year period |
| Centenary | a centennial |
| Centigrade | referring to a thermometer scale of 100 degrees where water freezes at 0 degrees and boils at 100 degrees |
