Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun The decimal part of a logarithm. In the logarithm 2.95424, the mantissa is 0.95424.
from The Century Dictionary.
 noun A supplementary treatise; a lesser work following one on the same subject.
 noun The decimal part of a logarithm: so called as being additional to the characteristic or integral part.
 noun [capitalized] In zoology, a genus of mollusks.
from the GNU version of the Collaborative International Dictionary of English.
 noun (Math.) The decimal part of a logarithm, as distinguished from the integral part, or
characteristic .
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun obsolete A
minor addition to atext .  noun mathematics The
part of acommon logarithm after the decimal point, the fractional part of a logarithm.  noun mathematics, computing, proscribed The
significand ; that part of afloatingpoint number or number inscientific notation that contains itssignificant digits .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun the positive fractional part of the representation of a logarithm; in the expression log 643 = 2.808 the mantissa is .808
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

Even when the mantissa can be expressed with a single base10 digit, like .4, it may not be the case in base 2.

 The peripatetic Alexander of Aphrodisias who fought fatalism in his [Greek: Peri heimarmenês], at the beginning of the third century, and who violently attacked the charlatanism and cupidity of the astrologers in another book (_De anima mantissa_, p. 180, 14, Bruns), formulated the contradiction in the popular beliefs of his time (_ibid. _, p. 182, 18):
The Oriental Religions in Roman Paganism Franz Cumont

I decided to take the mantissa of the latitude and longitude points (everything to the right of the decimal point) and combine them together to get a unique id.

When ColdFusion was generating the ID for the input, it was happily smashing the mantissa of the points together.

I decided to take the mantissa of the latitude and longitude points (everything to the right of the decimal point) and combine them together to get a unique id.

I decided to take the mantissa of the latitude and longitude points (everything to the right of the decimal point) and combine them together to get a unique id.

When ColdFusion was generating the ID for the input, it was happily smashing the mantissa of the points together.
O'Reilly News and Commentary John Barlow 2010

When ColdFusion was generating the ID for the input, it was happily smashing the mantissa of the points together.

The frexp intrinsic function has been updated to return a mantissa in the range of

I decided to take the mantissa of the latitude and longitude points (everything to the right of the decimal point) and combine them together to get a unique id.
O'Reilly News and Commentary John Barlow 2010
dameaning commented on the word mantissa
the slurred response from my date last night, after we fooled around a bit and then i sent him home
May 25, 2009
ruzuzu commented on the word mantissa
The significand (also mantissa or coefficient, sometimes also argument or fraction) is part of a number in scientific notation or a floatingpoint number, consisting of its significant digits. Depending on the interpretation of the exponent, the significand may represent an integer or a fraction. The word mantissa seems to have been introduced by Arthur Burks in 1946 writing for the Institute for Advanced Study at Princeton, although this use of the word is discouraged by the IEEE floatingpoint standard committee as well as some professionals such as the creator of the standard, William Kahan."
 https://en.wikipedia.org/w/index.php?title=Significand&oldid=850602451
August 8, 2018