To estimate is defined as to form an opinion or to guess something’s size, cost or value.(verb)
An example of to estimate is to look at a damaged car and see how much it may cost to repair.
The definition of an estimate is an opinion or a guess of the size, worth or cost of something.(noun)
An example of an estimate is a list of times and charges that it may cost to complete a construction job.
See estimate in Webster's New World College Dictionary
Origin: < L aestimatus, pp. of aestimare: see esteem
See estimate in American Heritage Dictionary 4
transitive verb es·ti·mat·ed, es·ti·mat·ing, es·ti·mates
Origin: Latin aestimāre, aestimāt-.
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