/ ˈlɒgərɪðəm; NAmE ˈlɔːg-; ˈlɑːg-/ (also informal log ) noun
( mathematics ) any of a series of numbers set out in lists which make it possible to work out problems by adding and subtracting instead of multiplying and dividing
► loga·rith·mic / ˌlɒgəˈrɪðmɪk; NAmE ˌlɔːg-; ˌlɑːg-/ adjective
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WORD ORIGIN
early 17th cent.: from modern Latin logarithmus , from Greek logos reckoning, ratio + arithmos number.