A group or series of one thousand items; the number one thousand.
From Greek 'khiliás' meaning 'thousand,' derived from 'khílioi' (a thousand). This Greek root appears in 'kilobyte,' 'kilometer,' and 'millennium,' all measuring units or time periods based on multiples of one thousand.
Ancient Greek had specific words for different large numbers—'chiliad' for 1,000 and 'myriad' for 10,000—showing how mathematical thinking shapes language, and these words survived in English more for philosophical and literary use than practical daily counting.
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