American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
(1)
WordNet
(2)
Elsewhere on the web
It also has one of the highest property tax rates in Michigan, yet has over 60,000 vacant dwellings (a guesstimate -- nobody keeps official count), meaning real estate values are in the toilet.— Latest Articles
Why would you "guesstimate" 10 when the answer is obviously 11?— Autism Hub
That is more than 12 years back and, since time takes away from accuracy, we will go to another source for our "guesstimate."— BloggingStocks
Rather than empty an entire can of water into your plant's container until you see water dripping over the sides or sticking your finger in the soil to "guesstimate" when it's time to water, there really is an easier solution.— News from www.thesunchronicle.com

American Heritage Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about twice a year.
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