Plural of chiliad; multiple groups or series of one thousand; thousands.
From 'chiliad' (a group of one thousand) + '-s' (English plural marker). The singular 'chiliad' comes from Greek 'khiliás' meaning 'thousand.'
The word 'chiliads' appears most often in philosophical and theological texts, especially when discussing Plato's ideas about cosmic time scales or Christian millennialist thought about 'chiliasm'—showing how ancient Greek mathematical concepts influenced religious and philosophical vocabulary.
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