👉 The term "septendecennial" refers to a specific period in history that is approximately 70 years long. This term was used by some historians to describe the period from the year 1924, when the first decimal system was introduced, to the year 1936, when the second decimal system was introduced. The concept of septendecennial refers to the fact that each decade is divided into seven years. This division was created by the United States Congress
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