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Old English Genesis, first book of the Pentateuch, from Latin genesis, adopted as title of first book of Old Testament in Vulgate, from Greek genesis "origin, creation, generation," from gignesthai "to be born," related to genos "race, birth, descent" (see genus). As such, it translated Hebrew bereshith, literally "in the beginning," which was the first word of the text, taken as its title. Extended sense of "origin, creation" first recorded in English c.1600.
genesis gen·e·sis (jěn'ĭ-sĭs)
n. pl. gen·e·ses (-sēz')
The coming into being of something; the origin.
The first book of the Old Testament; its first words are “In the beginning” (genesis is a Greek word for “beginning”). It covers the time from the beginning of the world through the days of the patriarchs, including the stories of the Creation, Adam and Eve, the Fall of Man, Cain and Abel, Noah and the Flood, God's covenant with Abraham, Abraham and Isaac, Jacob and Esau, and Joseph and his brothers.
The five books of Moses were collectively called the Pentateuch, a word of Greek origin meaning "the five-fold book." The Jews called them the Torah, i.e., "the law." It is probable that the division of the Torah into five books proceeded from the Greek translators of the Old Testament. The names by which these several books are generally known are Greek. The first book of the Pentateuch (q.v.) is called by the Jews Bereshith, i.e., "in the beginning", because this is the first word of the book. It is generally known among Christians by the name of Genesis, i.e., "creation" or "generation," being the name given to it in the LXX. as designating its character, because it gives an account of the origin of all things. It contains, according to the usual computation, the history of about two thousand three hundred and sixty-nine years. Genesis is divided into two principal parts. The first part (1-11) gives a general history of mankind down to the time of the Dispersion. The second part presents the early history of Israel down to the death and burial of Joseph (12-50). There are five principal persons brought in succession under our notice in this book, and around these persons the history of the successive periods is grouped, viz., Adam (1-3), Noah (4-9), Abraham (10-25:18), Isaac (25:19-35:29), and Jacob (36-50). In this book we have several prophecies concerning Christ (3:15; 12:3; 18:18; 22:18; 26:4; 28:14; 49:10). The author of this book was Moses. Under divine guidance he may indeed have been led to make use of materials already existing in primeval documents, or even of traditions in a trustworthy form that had come down to his time, purifying them from all that was unworthy; but the hand of Moses is clearly seen throughout in its composition.