| A | B |
| chronic | lasting a long time; constantly |
| chronicle | history; narrative |
| contemporary | characteristic of the present period of time |
| synchronize | to occur or cause to occur at the same instant |
| chronometer | a very accurate timepiece |
| tempo | rate of speed |
| temporary | lasting only a short time; not permanent |
| extemporaneous | not planned beforehand |
| anachronism | a person or thing that is chronologically out of place |
| chronological | arranged in or according to the order of time |