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eighteen (adj., n.)

"1 more than seventeen, twice nine; the number which is one more than seventeen; a symbol representing this number;" late 14c., eightene, earlier ahtene (c. 1200), from Old English eahtatiene, eahtatyne; see eight + -teen. Cognate with Old Frisian schtatine, Old Saxon ahtotian, Dutch achttien, Old High German ahtozehan, German achtzehn, Old Norse attjan, Swedish adertån.

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Definitions of eighteen
1
eighteen (n.)
the cardinal number that is the sum of seventeen and one;
Synonyms: " / xviii
2
eighteen (adj.)
being one more than seventeen;
Synonyms: " / xviii
From wordnet.princeton.edu