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estimate

/ˈɛstɪmeɪt/·verb

to judge an approximate value or amount quickly, without exact measurement
Fig. 1 — I run my eye down the jar of beans twice, the way you size a thing you have no time to count, and commit: about three hundred and fifty.
01Definition

To estimate is to judge a rough value quickly — a cost, a crowd, a count — accepting some error in exchange for speed. It comes from Latin aestimare, 'to value, appraise', the same root as esteem. A good estimate is not a lazy guess: it is anchored to something — experience, a sample, a rate — and can be checked later when you quantify the thing properly. English keeps a pronunciation split the eye cannot see: the verb ends in a full '-mate', the noun in a soft '-mət'.

02In use
  • iEngineers estimate the bridge load first, then calibrate their model against real traffic.
  • iiShe could estimate the jar's beans within ten before anyone had counted a single one.
  • iiiThe repair was estimated at four hundred dollars, and the final bill came close.
03Collocations
  • a conservative estimate
  • estimate the cost
  • estimated at
  • it is estimated that
  • a rough estimate

Family estimation (noun) · estimated (adjective) · estimator (noun) · underestimate (verb)

04Relations

=gauge, approximate, reckon, project, assess

≠calculate, measure

06TOEFL & IELTS

IELTS Task 1 runs on this word's passive frames — 'It is estimated that…', 'the population is estimated at 9 million' — and 'a conservative estimate' is a ready-made hedging phrase for Task 2. The trap is the heteronym: the verb is ES-ti-mate with a full final vowel, the noun ES-ti-mət with a schwa, the same split as graduate and separate. Keep ballpark estimates for speaking; in writing, rough or conservative are the safer modifiers.

07Asked
How do you pronounce estimate as a noun versus a verb?
Same spelling, different final vowel. The verb ends in a full '-mate': /ˈɛstɪmeɪt/, 'I ES-ti-mate the cost'. The noun softens to a schwa: /ˈɛstɪmət/, 'a rough ES-ti-mət'. The stress stays on the first syllable in both; only the last vowel moves. Aggregate and alternate play the same trick, so mastering one buys you the set.
What is the difference between estimate and estimation?
The estimate is the figure; estimation is the process that produced it — 'their estimate was 350; the estimation took three seconds'. Estimation also has a second, judgment-flavoured life in phrases like 'in my estimation', meaning in my considered opinion. Only estimate works as a verb, and in most sentences that name a number, estimate is the noun you want.
What is the difference between a quote and an estimate?
An estimate is an approximate, non-binding figure — the builder's honest sizing of the job, expected to shift somewhat as reality arrives. A quote is a fixed price that generally binds once you accept it. The distinction matters enough that trade bodies warn customers to check which one they were handed: an estimate can grow; a quote should not.
What does 'a conservative estimate' mean?
One made deliberately cautious — pitched low (or safe) so that reality will likely meet or beat it: 'at a conservative estimate, the repairs will take a month'. Its cousins run a scale of confidence: a rough estimate is quick and loose, like the three-second sizing of the jar in the scene above, while a ballpark figure is the informal end — fine in speech, casual in an essay.
Is it 'estimated at' or 'estimated to be'?
Both are standard, with a rhythm difference. Estimated at introduces a figure: 'the crowd was estimated at 50,000'. Estimated to be introduces a description or comparison: 'the site is estimated to be 3,000 years old'. The impersonal frame 'It is estimated that…' opens report-style sentences and is a staple of IELTS data writing for exactly that reason.
What do underestimate and overestimate mean?
They are estimate's directional children: to underestimate is to judge something smaller, cheaper, or weaker than it really is; to overestimate, the reverse. Both work as verb and noun with the same -mate/-mət vowel split as the parent word. Underestimate carries the extra idiomatic life — 'never underestimate…' — where the miscalculation being warned against is somebody's ability.