Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: guess + estimate

guesstimate

 noun
     
guess‧ti‧mate [countable] informal
an attempt to judge a quantity by guessing it [↪ estimate]:
Could you give us a guesstimate of the numbers involved?
—guesstimate verb [intransitive and transitive]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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