Chronogrammatic refers to an inscription or sentence written in such a way that the numerical values of its letters add up to a date or epoch. Some synonyms for chronogrammatic include calendrical, datable, epochal, historical, and numerological. Calendrical is used to describe something that pertains to a calendar, while datable refers to something that can be given a specific date. Epochal describes a significant period in history, while historical pertains to events in the past. Numerological refers to the study of numerical symbolism, which is used in chronogrammatic inscriptions. Overall, these synonyms highlight the significance of numerical values and dates in chronogrammatic usage.