The number equal to 8 times 10, or the ordinal position of something that is the 80th in a sequence.
From Old English 'ehtatig,' formed from 'eahta' (eight) plus '-tig' (ten). The suffix '-ty' for tens comes from proto-Germanic roots meaning 'ten groups.'
We write '80' but say 'eighty,' which seems random until you realize we're following rules set down over a thousand years ago when Old English speakers grouped numbers by tens and ones. The famous 1980s movie and song references made 'eighty' quintessential cool, but linguistically it's just a grammatical artifact we've carried forward.
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