'almanac' originates from Middle English, specifically the word 'almanak,' which was borrowed from Medieval Latin 'almanachus,' and further from Arabic 'al-manākh,' where 'al-' is the definite article and 'manākh' meant 'climate.'

'almanachus' transformed into the Middle English word 'almanak,' and eventually became the modern English word 'almanac.'

Initially, it meant 'a calendar or table of months,' but over time it evolved into its current meaning of 'a book containing a calendar and other data.'