English dictionary 18 meaning and definition Definition and meaning of 18 at MeaningMonkey.org. 18 meaning and definition in the English Dictionary. 18 nounDefinition of 18 (noun)the cardinal number that is the sum of seventeen and onesynonyms: eighteen, XVIII18 adjectiveDefinition of 18 (adjective)being one more than seventeensynonyms: eighteen, xviii Source: Princeton University Wordnet
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