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Definition of guesstimate

guesstimate

/ˈɡɛs.tɪ.meɪt/
guess · ti · mate

Plural:guesstimates
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Past Simple:guesstimated
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Past Participle:guesstimated
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Present Participle:guesstimating
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guesstimate Lexical Profile

guesstimate Game Scores & Validity

• noun

1

An informal estimate made without complete or adequate information, combining a rough calculation with guesswork.

Example

"Without the final expense reports from the regional offices, the accountant could only offer a rough guesstimate of the quarterly budget."

Synonyms
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Antonyms
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• verb

1

To form an approximate judgment or calculation of a quantity, cost, or size by combining partial reasoning with guesswork.

Example

"The event organizers guesstimated that nearly five hundred people attended the community festival over the weekend."

Synonyms
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Antonyms
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Word Nuance & Usage

Although widely accepted in everyday conversation and informal business contexts, 'guesstimate' (and its alternate spelling 'guestimate') is typically avoided in formal academic or legal writing in favor of 'rough estimate' or 'approximation'.

• Rhymes for guesstimate

Word Origin & Etymology

Coined in the United States in the 1930s by statisticians as a humorous portmanteau blending the words 'guess' and 'estimate'.

Cite this Entry


Wordmom. (2026). Definition of Guesstimate. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/guesstimate
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