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v. Simple past tense and past participle of estimate.

adj. calculated approximately.

"The main reason was the sharp drop in oil prices and me steady growth in Brazil's domestic petroleum production, e.g., about 212 million barrels in 1988 at an estimated cost of $20 per barrel versus an “estimated cost” of alcohol of $45 per barrel according to Young (1989)."

estimate   

overestimated    underestimated