mantissa

noun
man·tis·sa | \man-ˈti-sə \

Definition of mantissa 

: the part of a logarithm to the right of the decimal point

First Known Use of mantissa

1846, in the meaning defined above

History and Etymology for mantissa

Latin mantisa, mantissa makeweight, from Etruscan

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The first known use of mantissa was in 1846

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