Unit 1 Introduction

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Gregorian Calendar

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A calendar system introduced by Pope Gregory XIII in 1582, which is the calendar system used by most of the world today.

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Anno Domini

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Latin for 'In the year of our Lord', used to label or number years in the Julian and Gregorian calendars.

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Periodization

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The process or study of categorizing the past into discrete, quantified named blocks of time.

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Decade

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A period of ten years.

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Century

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A period of one hundred years.

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Millennium

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A period of one thousand years.

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Mesopotamia

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An ancient region located in the eastern Mediterranean, known as the cradle of civilization.

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Ancient Egypt

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A civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River.

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Irrigation

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The method in which water is supplied to plants at regular intervals for agriculture.

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Civilization

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A complex human society, usually made up of different cities, with certain characteristics of cultural and technological development.