One of a class of auxiliary numbers, devised by John Napier, of Merchiston, Scotland (1550-1617), to abridge arithmetical calculations, by the use of addition and subtraction in place of multiplication and division.
logarithm in French is logarithme
logarithm in German is Logarithmus
logarithm in Hungarian is logaritmus
logarithm in Italian is logaritmo
logarithm in Spanish is logaritmo