/ Dictionary / Index O Oneida Lake: Meaning and Definition of Find definitions for: Onei'da Lake' Pronunciation: [key] a lake in central New York. 20 mi. (32 km) long; 5 mi. (8 km) wide. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Oneida Community O'Neill Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language