Meaning

noun an annual publication including weather forecasts and other miscellaneous information arranged according to the calendar of a given year

noun an annual publication containing tabular information in a particular field or fields arranged according to the calendar of a given year

originFrom Middle English almenak, from Old French almanach, from Medieval Latin almanachus, from Andalusian Arabic الْمَنَاخ (al-manāḵ, “almanac, calendar”), from Arabic الْمُنَاخ (al-munāḵ, “climate”).

Etymology from Wiktionary, CC BY-SA 3.0