/ Dictionary / Index N National War Labor Board: Meaning and Definition of Find definitions for: Na'tional War' La'bor Board" Pronunciation: [key] — U.S. Govt. U.S. Govt. the board (1942–45) that mediated and arbitrated labor disputes. Abbr.: NWLB, WLB Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. National Transportation Safety Board National Weather Service Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language