/ Dictionary / Index E eighteen: Meaning and Definition of Find definitions for: eight•een Pronunciation: (ā'tēn'), [key] — n. a cardinal number, ten plus eight. a symbol for this number, as 18 or XVIII. a set of this many persons or things. —adj. amounting to 18 in number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: eighteen (Thesaurus) 8d eighteenmo Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language