denoting a quantity consisting of 1,000 items or units
"The charity raised exactly three thousand dollars in just one afternoon from local donors."
A numerical value equal to 1,000 = 10 × 100 = 10³
"The ancient Roman census recorded exactly a thousand households in the newly settled district."
The word "thousand" comes from Old English, where it originally meant exactly one thousand. It traveled into modern English through Middle English while retaining its original numerical meaning.