extension: a mutually agreed delay in the date set for the completion of a job or payment of a debt
abstraction: a general concept formed by extracting common features from specific examples
ludi saeculares: the centennial rites and games of ancient Rome that marked the commencement of a new generation (100 years representing the longest life in a generation); observances may have begun as early as the 5th century BC and lasted well into the Christian era