Meaning

noun an approximate calculation of quantity or degree or worth

noun a judgment of the qualities of something or somebody

noun a document appraising the value of something (as for insurance or taxation)

originBorrowed from Latin aestimātus, perfect passive participle of aestimō (“to estimate”) (see -ate), older form aestumō (“to value, rate, esteem”); from Old Latin *ais-temos (“one who cuts copper”), meaning one in the Roman Republic who mints money. Compare Middle English estymatt (“reputed”) / estimat. See also the doublet esteem, as well as aim.

Etymology from Wiktionary, CC BY-SA 3.0