Dictionary.net

• a radix numeration system in which the location of the decimal point is indicated by an exponent of the radix; the floating-point representation of 0.0012 is 0.12-2 where -2 is the exponent

2006 - WordNet 3.0
By Princeton University

• a radix numeration system in which the location of the decimal point is indicated by an exponent of the radix; the floating-point representation of 0.0012 is 0.12-2 where -2 is the exponent

2011 - English Dictionary Database
By DataStellar Co., Ltd