Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An estimate based on conjecture.
from the GNU version of the Collaborative International Dictionary of English.
- noun an estimate based on little information, being little better than a guess.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun informal  An estimate that is hardly any better than aguess , often because it is based oninsufficient orunreliable data .
- verb intransitive To make a guesstimate.
- verb transitive To make a guesstimate of a specific quantity.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- verb estimate based on a calculation
- noun an estimate that combines reasoning with guessing
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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								My guesstimate is that half of the officially unemployed have been out of work for over a year. Coyote Blog » Blog Archive » The Cost of our New Corporate State 2010 
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								My guesstimate is that they have not and in fact, have a higher standard of living than their "counterparts" (isn't that term entirely relative and even artificial?) 10, 20 and 30 years ago did. Poverty and Income Distribution, Arnold Kling | EconLog | Library of Economics and Liberty 2009 
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								My best guesstimate is that Kasten wasn’t brought here to build the Washington Braves. Kast away - Nats president throws it back Box Seats blogger 2010 
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								Ivan Arbuthnot, who is on secondment to the NAHT from his role as principal of Priory Integrated College in Holywood, said: "We have been told that we should soon get indicative budgets - a 'guesstimate' - which will put funding at the same as last year. 
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								Ivan Arbuthnot, who is on secondment to the NAHT from his role as principal of Priory Integrated College in Holywood, said: "We have been told that we should soon get indicative budgets - a 'guesstimate' - which will put funding at the same as last year. 
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								I'm not even going to try to "guesstimate" how many words I've written on LJ over the past six years. Entry #2,500 greygirlbeast 2010 
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								I'm not even going to try to "guesstimate" how many words I've written on LJ over the past six years. Entry #2,500 greygirlbeast 2010 
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								John Curry, spokesman for BP, said the 5,000-barrel-a-day figure was just a "guesstimate" as "it's very difficult to accurately gauge how much there is." 
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								To put this kind of guesstimate story out there is a disservice to your readers and as it will no doubt be referenced further down the line, should be an embarrassment to Harvard University. Print is still king: Only 3 percent of newspaper reading happens online » Nieman Journalism Lab 2009 
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								The HRW survey concludes that as many as 600 civilians died and several thousand were injured in the 90 strikes, a toll lower than a Pentagon "guesstimate" of 1,500 civilian deaths. 
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