Sentence:  Despite the high acclaim and wide acceptance of Bede's work, centuries later, medieval <WSD>computists</WSD> were still working on the same problem. Given the (relatively) confined scope of the mathematics involved, how did computus manage to remain such a core intellectual pursuit? In part, <WSD>computists</WSD> refined the basic model Bede had popularised. The introduction of a "golden number" in circa 1150 enabled <WSD>computists</WSD> to reference a given year's position in the 19-year cycle. It was calculated as (year number, divided modulo 19) + 1. By this reckoning, 2013/ 19, remainder 18; 18+1 = 19. Thus, 2013 is the 19th year in the 19-year cycle.Webster 1913 
Meaning of the word marked with <WSD> tags:  One who performs computus (calculation of the date of Easter).