The ordinal number matching 1,000; the position or fraction equal to 1/1000 of something.
From Old English 'þūsend' (thousand), from Germanic roots meaning 'strong' or 'thick,' originally describing a large number; '-th' is the ordinal suffix making it 'the 1000th one.'
The word 'thousand' has mysterious Germanic roots—'þūsend' might come from 'thick' or 'strong,' suggesting ancient people described huge numbers as being 'thick' or dense, similar to how we say 'a thick crowd' for a huge gathering.
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