/ Dictionary / Index S Seneca Lake: Meaning and Definition of Find definitions for: Sen'eca Lake' Pronunciation: [key] a lake in W New York: one of the Finger Lakes. 35 mi. (56 km) long. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Seneca Falls Convention Seneca snakeroot Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language