| A | B |
|---|
| TRI | <G. "three" |
| TRES | <L. "three" |
| trilogy | a group of literary or misical works that have a related theme |
| trisect | to divide into three parts |
| triumvirate | a group of three, especially in authority |
| QUATUS | <L. "fourth" |
| QUATOUR | <L. "four" |
| quadrant | a quarter of a circle or of its circumference. |
| quadrant2 | an early machine for measuring altitudes2 |
| quadrant3 | any of the four parts of an area divided by perpendicular lines3 |
| quartet | a musical composition for four voices or instruments |
| quartet2 | a set of four, especially of four musicians2 |
| quatrain | a stanza or group of four lines of poetry |
| DECEM | <L. "ten" |
| decimate | to destroy a large part of |
| decimate2 | to kill on in every ten2 |
| decathlon | an atheltic contest in which each contestant takes part in ten events |
| CENTUM | <L. "hundred" |
| bicentennial | a two-hundredth anniversary |
| bicentennial2 | happening every 200 years2 |
| centenary | pertaining to a 100-year period |
| centenary2 | a centennial2 |
| centigrade | referring to a themometer scale of 100 degrees where water freezes at 0° and boils at 100° |
