Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 adjective Tending to multiply or capable of multiplying or increasing.
 adjective Having to do with multiplication.
from The Century Dictionary.
 Tending to multiply or increase; having the power to multiply numbers.
 A numeral adjective describing an object as repeated a certain number of times or as consisting of a certain number of parts, such as single, double (duplex), triple (treble), quadruple, quintuple, or twofold, threefold, fourfold, fivefold.
from the GNU version of the Collaborative International Dictionary of English.
 adjective Tending to multiply; having the power to multiply, or incease numbers.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective Of or pertaining to
multiplication .  adjective mathematics, of a function, etc.
Distributive overmultiplication .  adjective algebra Having
multiplication as anoperator .  noun grammar A grammatical adverbial
case in Finnish.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adjective tending or having the power to multiply or increase in number or quantity or degree
Etymologies
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Examples

If you have an intuitive grasp on the notion that risk is determined by the product (as in multiplicative) of the likelihood of something going wrong and the consequences should something go wrong, and you are able to honestly evaluate both, then your behavior might be tempered, somewhat, compared to the likes of Souder.
Random Thought Number Two on the Hoosier HypocriteNow With More Middleaged Sex Appeal. 2010

We call the multiplicative factor in equation (4) the factor of underestimation,
PLoS ONE Alerts: New Articles Hiroshi Nishiura et al. 2009

Under this model, the responses to ITD and ILD in ICcl are only approximately multiplicative, which is consistent with the data
PLoS ONE Alerts: New Articles Brian J. Fischer et al. 2009

These multiple inputs and outputs have a kind of multiplicative impact on data rates and throughput, and the same technology is part of mobile WiMAX and LTE.

Recently, though, the rise of blogging, Wikipedia, and opensource software, showed me the power of a kind of multiplicative force: (pleasure of hobbies) multiplied by (professional skills).

I mean long sequences with low discrepancy  have to have some kind of multiplicative structure.
Gowers's Weblog 2010

So, when Pitbull's "Hotel Room Service" is hilariously yet rightly paired with Depeche Mode's "Just Can't Get Enough," 20somethings and 30 and 40somethings arrive at the idea of what's augmenting what from different vantage points, but there's a universal recognition among those at the show that the pairing works, gaining a multiplicative effect as a result of their convergence.
Phil West: Collage, Alchemy, and Glowsticks: A Night With Girl Talk Phil West 2011

"A cluster must be larger than the entities, their output should be multiplicative, not just additive," he says.

It is the mechanism by which we will find solutions to our most urgent problems, because the urgent relevant topics will be dynamically connected to passionate minds, an effect we have shown is scalable and multiplicative instead of linear and additive.
Mehret Mandefro: The Revolution of Relevance Mehret Mandefro 2010

So, when Pitbull's "Hotel Room Service" is hilariously yet rightly paired with Depeche Mode's "Just Can't Get Enough," 20somethings and 30 and 40somethings arrive at the idea of what's augmenting what from different vantage points, but there's a universal recognition among those at the show that the pairing works, gaining a multiplicative effect as a result of their convergence.
Phil West: Collage, Alchemy, and Glowsticks: A Night With Girl Talk Phil West 2011
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