1000 or one thousand is the natural number following 999 and preceding 1001.In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.. A group of one thousand units is sometimes known, from Ancient Greek, as a chiliad. [1] A period of one thousand years may be known as a chiliad or, more often from Latin, as a ... More @Wikipedia
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