Now updated for CSW19. New words, if any, and new inflections of existing words, are shown in red.
| analemmatic | relating to the seasonal difference between time as shown by clocks and by the sun. |
| antedate | to date from before. |
| antedating | the act of dating from before. |
| atemporal | without consideration of time. |
| backdate | to predate. |
| bissextile | of or pertaining to the leap year; (noun) the extra day in the leap year. |
| calendar | an almanac or table of months, days, and seasons; (verb) to register or enter in a calendar. |
| calendric | relating to the calendar. |
| calendrical | relating to the calendar. |
| chronometer | an instrument for measuring time. |
| clepsydra | (Lat.) an instrument which measures time by trickling water. |
| datable | that may be dated. |
| dateable | that may be dated. |
| dateline | an imaginary line marking the difference between time zones; (verb) to mark with a dateline. |
| epagomenal | of days, intercalary, or inserted between others. |
| foredate | to date before the true time; to antedate. |
| geochronologic | relating to geochronology. |
| geochronology | the study of measuring geological time. |
| gnomon | (Greek) the pin of a sundial. |
| gnomonic | of or pertaining to a gnomon, a sundial. |
| gnomonical | of or pertaining to a gnomon, a sundial. |
| gnomonics | (Hist.) the art of measuring time using sundials. |
| gnomonology | a treatise on gnomonics. |
| heterochrony | divergence from normal time sequence in development. |
| horographer | one who constructs timepieces. |
| horologe | any instrument for telling the time. |
| horologic | relating to horology, the science of measuring time. |
| horological | relating to horology, the science of measuring time. |
| horologion | a horologe. |
| horologium | (Obs.) a horologe, an instrument for telling the time. |
| horology | the science of measuring time. |
| horometry | the science of time measurement. |
| hourglass | an instrument for measuring the hours by the running of sand through a narrow neck. |
| hourplate | a timepiece dial. |
| intercalarily | (Adv.) INTERCALARY, inserted in a calendar. |
| intercalary | inserted in a calendar (for example, a day or a month). |
| isochron | a line connecting points of equal time difference. |
| isochronal | uniform in time; recurring at regular intervals; eg isochronal vibrations or oscillations. |
| isochronally | (Adv.) ISOCHRONAL, uniform in time; recurring at regular intervals. |
| isochrone | a line connecting points of equal time difference. |
| kalendar | an almanac or table of months, days, and seasons; (verb) to register or enter in a calendar. |
| luach | (Hebrew) a Jewish calendar showing dates of festivals and the Sabbath. |
| menology | a calendar, esp one commemorating specific people. |
| redate | to date again. |
| sandglass | an instrument for measuring time by the running of sand. |
| stemwinder | a keyless watch. |
| stopwatch | an accurate watch readily started and stopped, used in timing a race, etc. |
| sundial | a type of time-telling device. |
| timepiece | any kind of clock. |
| watchcase | the case housing the mechanism of a watch. |
| wristwatch | a small watch that is attached to a bracelet or strap and is worn around the wrist. |
| zonetime | standard time used at sea. |