Plural of calendar; systems for organizing days, weeks, months, and years, typically showing dates and often used for scheduling. Physical or digital charts displaying this temporal organization.
From Latin 'calendarium' meaning 'account book,' from 'calendae' (the first day of the Roman month when debts were due). The word 'calendae' comes from 'calare' meaning 'to call out.' Romans would announce the new moon and call out the days until the next important date.
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