/ Dictionary / Index N Nellis Air Force Base: Meaning and Definition of Find definitions for: Nel'lis Air' Force" Base" Pronunciation: (nel'is), [key] the largest air base in the U.S. Air Force's Tactical Air Command, located near Las Vegas, Nev., and developed from what began in 1941 as a U.S. Army Air Corps field. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Nellie nelly Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language