Plural of eighteen; multiple sets or groups of eighteen items, or the number eighteen used repeatedly.
From Old English 'eahtatiene', a compound of 'eaht' (eight) and 'tene' (ten). The plural simply adds the standard English '-s' suffix.
In card games and dice, 'eighteens' can be significant—an eighteen in blackjack versus a nineteen might be the difference between winning and losing a hand!
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