What does estimation mean?
Estimation is a noun that refers primarily to the act or result of forming a judgment about the value, size, amount, or quality of something, particularly when precise measurement is impossible or impractical. An architect might offer an estimation of a building's cost, while a scientist might make an estimation of a population based on sampling data. A second, somewhat more literary sense conveys favorable regard — one can be held in high estimation by colleagues or the public, meaning they are deeply respected. The word carries a slightly formal tone and is frequently used in the fixed phrase "in my estimation" to introduce a personal assessment. It derives from the Latin aestimare, meaning to value or appraise, sharing its origin with "esteem" and "estimate." While closely related to those words, estimation emphasizes the mental process of judging rather than any single figure produced. Its versatility across practical, scientific, and social registers makes it a valuable addition to a well-rounded vocabulary.
A judgment or approximate calculation of the value, size, quantity, or quality of something.
"His estimation of the crowd size proved remarkably accurate."
Often used with modifiers such as rough, careful, or conservative.
Favorable regard or respect for someone's character or worth.
"Despite her retirement, she remains in high estimation among her former students."
Typically appears in the phrase "in high/low estimation."
The plural is used when referring to multiple separate acts of estimating or differing judgments, though it is less common than the singular.
"Their estimations varied widely, so the team sought additional data."
When you hold someone in high estimation, you're using the same Latin root that gives us 'esteem' — literally 'to appraise their worth.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of estimation
Estimation comes from the Latin aestimatio, derived from aestimare, meaning to value, appraise, or estimate. The word entered English in the late Middle English period via Old French estimacion, initially carrying senses related to valuation and reputation. Its cognates include esteem and estimate, all rooted in the same Latin verb. Over time, estimation broadened from monetary valuation to encompass general judgments of quantity, quality, and worth.
Related word forms
How estimation is actually used
"Estimation" tends toward formal register. The phrase "in my/his/her estimation" is common in both speech and writing when offering a subjective judgment. In everyday contexts, "estimate" is often preferred when referring to a specific numerical figure.
Easily confused with estimation
An estimate is typically a specific calculated figure or judgment, while estimation refers more broadly to the act or process of judging or calculating.